Data Analysis Expressions - DAX - Reference

Data Analysis Expressions (DAX) Reference SQL Server 2012 Books Online Summary: The Data Analysis Expressions (DAX) language is a library of functions and operators that can be combined to build formulas and expressions. Category: Reference Applies to: SQL Server 2012 Source: SQL Server Books Online (link to source content) E-book publication date: June 2012 Copyright © 2012 by Microsoft Corporation All rights reserved. No part of the contents of this book may be reproduced or transmitted in any form or by any means without the written permission of the publisher. Microsoft and the trademarks listed at http://www.microsoft.com/about/legal/en/us/IntellectualProperty/Trademarks/EN-US.aspx are trademarks of the Microsoft group of companies. All other marks are property of their respective owners. The example companies, organizations, products, domain names, email addresses, logos, people, places, and events depicted herein are fictitious. No association with any real company, organization, product, domain name, email address, logo, person, place, or event is intended or should be inferred. This book expresses the author’s views and opinions. The information contained in this book is provided without any express, statutory, or implied warranties. Neither the authors, Microsoft Corporation, nor its resellers, or distributors will be held liable for any damages caused or alleged to be caused either directly or indirectly by this book. Contents Data Analysis Expressions (DAX) Reference .......................................................................................................... 8 DAX Syntax Specification for PowerPivot .............................................................................................................. 8 DAX Operator Reference for PowerPivot ............................................................................................................ 15 Parameter-Naming Conventions ........................................................................................................................... 20 Understanding Functions for Parent-Child Hierarchies in DAX.................................................................. 22 DAX Function Reference............................................................................................................................................ 27 DAX Queries ............................................................................................................................................................... 27 DAX Query Syntax Reference........................................................................................................................... 28 Parameters for DAX Queries ............................................................................................................................ 29 Date and Time Functions ...................................................................................................................................... 30 Time Intelligence Functions.............................................................................................................................. 31 CLOSINGBALANCEMONTH Function........................................................................................................ 32 CLOSINGBALANCEQUARTER Function .................................................................................................... 34 CLOSINGBALANCEYEAR Function.............................................................................................................. 35 DATEADD Function .......................................................................................................................................... 37 DATESBETWEEN Function ............................................................................................................................. 38 DATESINPERIOD Function............................................................................................................................. 40 DATESMTD Function ....................................................................................................................................... 41 DATESQTD Function........................................................................................................................................ 42 DATESYTD Function......................................................................................................................................... 44 ENDOFMONTH Function ............................................................................................................................... 45 ENDOFQUARTER Function............................................................................................................................ 46 ENDOFYEAR Function ..................................................................................................................................... 47 FIRSTDATE Function ........................................................................................................................................ 49 FIRSTNONBLANK Function ........................................................................................................................... 50 LASTDATE Function ......................................................................................................................................... 51 LASTNONBLANK Function ............................................................................................................................ 53 NEXTDAY Function........................................................................................................................................... 54 NEXTMONTH Function................................................................................................................................... 55 NEXTQUARTER Function................................................................................................................................ 56 NEXTYEAR Function......................................................................................................................................... 58 OPENINGBALANCEMONTH Function....................................................................................................... 59 OPENINGBALANCEQUARTER Function.................................................................................................... 61 OPENINGBALANCEYEAR Function............................................................................................................. 62 PARALLELPERIOD Function........................................................................................................................... 64 PREVIOUSDAY Function................................................................................................................................. 66 PREVIOUSMONTH Function......................................................................................................................... 67 PREVIOUSQUARTER Function...................................................................................................................... 69 PREVIOUSYEAR Function ............................................................................................................................... 70 SAMEPERIODLASTYEAR Function .............................................................................................................. 71 STARTOFMONTH Function ........................................................................................................................... 73 STARTOFQUARTER Function........................................................................................................................ 74 STARTOFYEAR Function ................................................................................................................................. 75 TOTALMTD Function ....................................................................................................................................... 76 TOTALQTD Function........................................................................................................................................ 78 TOTALYTD Function......................................................................................................................................... 79 DATE Function ....................................................................................................................................................... 81 DATEVALUE Function.......................................................................................................................................... 85 DAY Function ......................................................................................................................................................... 86 EDATE Function ..................................................................................................................................................... 87 EOMONTH Function............................................................................................................................................ 89 HOUR Function ..................................................................................................................................................... 90 MINUTE Function ................................................................................................................................................. 91 MONTH Function ................................................................................................................................................. 92 NOW Function ....................................................................................................................................................... 94 SECOND Function ................................................................................................................................................ 94 TIME Function ........................................................................................................................................................ 96 TIMEVALUE Function........................................................................................................................................... 98 TODAY Function ................................................................................................................................................... 99 WEEKDAY Function.............................................................................................................................................. 99 WEEKNUM Function.......................................................................................................................................... 101 YEAR Function ..................................................................................................................................................... 103 YEARFRAC Function........................................................................................................................................... 104 Filter Functions ........................................................................................................................................................ 106 ALL Function......................................................................................................................................................... 107 ALLEXCEPT Function.......................................................................................................................................... 112 ALLNOBLANKROW Function.......................................................................................................................... 114 ALLSELECTED Function..................................................................................................................................... 118 CALCULATE Function ........................................................................................................................................ 126 CALCULATETABLE Function............................................................................................................................ 128 DISTINCT Function ............................................................................................................................................. 129 EARLIER Function................................................................................................................................................ 131 EARLIEST Function ............................................................................................................................................. 134 FILTER Function ................................................................................................................................................... 135 FILTERS Function................................................................................................................................................. 137 HASONEFILTER Function ................................................................................................................................. 138 HASONEVALUE Function................................................................................................................................. 139 ISCROSSFILTERED Function ............................................................................................................................ 141 ISFILTERED Function .......................................................................................................................................... 145 KEEPFILTERS Function....................................................................................................................................... 148 RELATED Function .............................................................................................................................................. 151 RELATEDTABLE Function ................................................................................................................................. 154 USERELATIONSHIP Function .......................................................................................................................... 155 VALUES Function ................................................................................................................................................ 157 Information Functions .......................................................................................................................................... 159 CONTAINS Function .......................................................................................................................................... 160 CUSTOMDATA Function .................................................................................................................................. 161 ISBLANK Function............................................................................................................................................... 161 ISERROR Function .............................................................................................................................................. 162 ISLOGICAL Function .......................................................................................................................................... 163 ISNONTEXT Function ........................................................................................................................................ 164 ISNUMBER Function .......................................................................................................................................... 165 ISTEXT Function................................................................................................................................................... 166 LOOKUPVALUE Function ................................................................................................................................. 167 PATH Function ..................................................................................................................................................... 168 PATHCONTAINS Function............................................................................................................................... 170 PATHITEM Function........................................................................................................................................... 171 PATHITEMREVERSE Function ......................................................................................................................... 172 PATHLENGTH Function .................................................................................................................................... 174 USERNAME Function......................................................................................................................................... 174 Logical Functions .................................................................................................................................................... 175 AND Function ...................................................................................................................................................... 176 FALSE Function .................................................................................................................................................... 179 IF Function............................................................................................................................................................. 180 IFERROR Function............................................................................................................................................... 181 NOT Function....................................................................................................................................................... 182 OR Function .......................................................................................................................................................... 183 SWITCH Function................................................................................................................................................ 186 TRUE Function ..................................................................................................................................................... 187 Math and Trig Functions ..................................................................................................................................... 188 ABS Function ........................................................................................................................................................ 189 CEILING Function................................................................................................................................................ 190 CURRENCY Function ......................................................................................................................................... 192 EXP Function ........................................................................................................................................................ 193 FACT Function...................................................................................................................................................... 194 FLOOR Function .................................................................................................................................................. 195 INT Function ......................................................................................................................................................... 196 ISO.CEILING Function........................................................................................................................................ 197 LN Function .......................................................................................................................................................... 199 LOG Function ....................................................................................................................................................... 199 LOG10 Function .................................................................................................................................................. 200 MOD Function ..................................................................................................................................................... 201 MROUND Function ............................................................................................................................................ 202 PI Function ............................................................................................................................................................ 203 POWER Function................................................................................................................................................. 204 QUOTIENT Function .......................................................................................................................................... 205 RAND Function.................................................................................................................................................... 206 RANDBETWEEN Function ................................................................................................................................ 207 ROUND Function ................................................................................................................................................ 207 ROUNDDOWN Function.................................................................................................................................. 209 ROUNDUP Function .......................................................................................................................................... 210 SIGN Function ...................................................................................................................................................... 212 SQRT Function ..................................................................................................................................................... 213 SUM Function ...................................................................................................................................................... 213 SUMX Function.................................................................................................................................................... 214 TRUNC Function ................................................................................................................................................. 215 Statistical Functions ............................................................................................................................................... 216 ADDCOLUMNS Function ................................................................................................................................. 218 AVERAGE Function............................................................................................................................................. 219 AVERAGEA Function.......................................................................................................................................... 221 AVERAGEX Function .......................................................................................................................................... 222 COUNT Function................................................................................................................................................. 223 COUNTA Function.............................................................................................................................................. 224 COUNTAX Function ........................................................................................................................................... 225 COUNTBLANK Function ................................................................................................................................... 226 COUNTROWS Function .................................................................................................................................... 227 COUNTX Function .............................................................................................................................................. 229 CROSSJOIN Function ....................................................................................................................................... 230 DISTINCTCOUNT Function.............................................................................................................................. 232 GENERATE Function ......................................................................................................................................... 233 GENERATEALL Function ................................................................................................................................... 236 MAX Function ...................................................................................................................................................... 239 MAXA Function ................................................................................................................................................... 240 MAXX Function.................................................................................................................................................... 241 MIN Function ....................................................................................................................................................... 242 MINA Function .................................................................................................................................................... 243 MINX Function..................................................................................................................................................... 245 RANK.EQ Function ............................................................................................................................................ 246 RANKX Function.................................................................................................................................................. 248 ROW Function...................................................................................................................................................... 251 STDEV.S Function ............................................................................................................................................... 252 STDEV.P Function ............................................................................................................................................... 253 STDEVX.S Function............................................................................................................................................. 254 STDEVX.P Function............................................................................................................................................. 255 SUMMARIZE Function ...................................................................................................................................... 256 TOPN Function .................................................................................................................................................... 263 VAR.S Function .................................................................................................................................................... 265 VAR.P Function .................................................................................................................................................... 266 VARX.S Function ................................................................................................................................................. 267 VARX.P Function ................................................................................................................................................. 268 Text Functions.......................................................................................................................................................... 270 BLANK Function .................................................................................................................................................. 271 CONCATENATE Function................................................................................................................................. 272 EXACT Function ................................................................................................................................................... 274 FIND Function ...................................................................................................................................................... 275 FIXED Function .................................................................................................................................................... 276 FORMAT Function .............................................................................................................................................. 278 Pre-Defined Numeric Formats for the FORMAT Function .............................................................. 279 Custom Numeric Formats for the FORMAT Function....................................................................... 281 Pre-defined Date and Time formats for the FORMAT Function ................................................... 287 Custom Date and Time formats for the FORMAT Function ........................................................... 287 LEFT Function ....................................................................................................................................................... 291 LEN Function ........................................................................................................................................................ 292 LOWER Function ................................................................................................................................................. 293 MID Function ....................................................................................................................................................... 294 REPLACE Function .............................................................................................................................................. 295 REPT Function ...................................................................................................................................................... 296 RIGHT Function ................................................................................................................................................... 298 SEARCH Function ............................................................................................................................................... 299 SUBSTITUTE Function ....................................................................................................................................... 301 TRIM Function...................................................................................................................................................... 302 UPPER Function................................................................................................................................................... 303 VALUE Function................................................................................................................................................... 304 Formula Compatibility in DirectQuery Mode .................................................................................................. 305 Data Analysis Expressions (DAX) Reference The Data Analysis Expressions (DAX) language is a library of functions and operators that can be combined to build formulas and expressions. This section provides topics that describe function syntax and other attributes of the DAX language. For an overview of how you can use DAX formulas, see Getting Started with Data Analysis Expressions (DAX). In this Section DAX Syntax Specification Operator Reference Function Reference See Also Key Concepts in DAX Data Types Supported in PowerPivot Workbooks DAX Syntax Specification for PowerPivot Data Analysis Expressions (DAX) is a library of functions, operators, and constants that can be combined to build formulas and expressions in PowerPivot for Excel. This section provides details about the syntax and requirements of the DAX language. For examples of the kinds of formulas that you can build, and how you can use expressions to filter tables and change context, see Getting Started with Data Analysis Expressions (DAX). This topic contains the following sections: Syntax Requirements Naming Requirements Functions Operators and Constants Data Types Syntax Requirements DAX formulas are very similar to the formulas you type in Excel tables, but there are some key differences. • In Microsoft Excel you can reference individual cells or arrays; in PowerPivot you can reference only complete tables or columns of data. However, If you need to work 8 with only part of a column, or with unique values from a column, you can achieve similar behavior by using DAX functions that filter the column or return unique values. • DAX formulas do not support exactly the same data types as Microsoft Excel. In general, DAX provides more data types than Excel does, and DAX performs implicit type conversions on some data when importing. For more information, see Data Types in DAX. A DAX formula always starts with an equal sign (=). After the equals sign, you can provide any expression that evaluates to a scalar, or an expression that can be converted to a scalar. These include the following: • A scalar constant, or expression that uses a scalar operator (+,-,*,/,>=,...,&&, ...) • References to columns or tables. The DAX language always uses tables and columns as inputs to functions, never an array or arbitrary set of values. • Operators, constants, and values provided as part of an expression. • The result of a function and its required arguments. Some DAX functions return a table instead of a scalar, and must be wrapped in a function that evaluates the table and returns a scalar; unless the table is a single column, single row table, then it is treated as a scalar value. Most PowerPivot functions require one or more arguments, which can include tables, columns, expressions, and values. However, some functions, such as PI, do not require any arguments, but always require parentheses to indicate the null argument. For example, you must always type PI(), not PI. You can also nest functions within other functions. • Expressions. An expression can contain any or all of the following: operators, constants, or references to columns. For example, the following are all valid formulas. Formula Result =3 3 ="Sales" Sales ='Sales'[Amount] If you use this formula within the Sales table, you will get the value of the column Amount in the Sales table for the current row. =(0.03 *[Amount]) Three percent of the value in the Amount column of the current table. =0.03 * [Amount] Although this formula can be used to calculate a percentage, the result is not 9 Formula Result shown as a percentage unless you apply formatting in the table. =PI() The value of the constant pi. Note Formulas can behave differently depending on whether they are used in a calculated column, or in a measure within a PivotTable. You must always be aware of the context and how the data that you use in the formula is related to other data that might be used in the calculation. For more information, see Context in DAX Formulas. Naming Requirements A PowerPivot window can contain multiple tables, each on its own tab. Together the tables and their columns comprise a database stored in the PowerPivot xVelocity inmemory analytics engine (VertiPaq). Within that database, all tables must have unique names. The names of columns must also be unique within each table. All object names are case-insensitive; for example, the names SALES and Sales would represent the same table. Each column and measure that you add to an existing PowerPivot database must belong to a specific table. You specify the table that contains the column either implicitly, when you create a calculated column within a table, or explicitly, when you create a measure and specify the name of the table where the measure definition should be stored. When you use a table or column as an input to a function, you must generally qualify the column name. The fully qualified name of a column is the table name, followed by the column name in square brackets: for examples, 'U.S. Sales'[Products]. A fully qualified name is always required when you reference a column in the following contexts: • As an argument to the function, VALUES • As an argument to the functions, ALL or ALLEXCEPT • In a filter argument for the functions, CALCULATE or CALCULATETABLE • As an argument to the function, RELATEDTABLE • As an argument to any time intelligence function An unqualified column name is just the name of the column, enclosed in brackets: for example, [Sales Amount]. For example, when you are referencing a scalar value from the same row of the current table, you can use the unqualified column name. If the name of a table contains spaces, reserved keywords, or disallowed characters, you must enclose the table name in single quotation marks. You must also enclose table names in quotation marks if the name contains any characters outside the ANSI 10 alphanumeric character range, regardless of whether your locale supports the character set or not. For example, if you open a workbook that contains table names written in Cyrillic characters, such as ‘Таблица’, the table name must be enclosed in quotation marks, even though it does not contain spaces. Note To make it easier to enter the fully qualified names of columns, we recommend that you use the formula AutoComplete feature in the client. Tables • Table names are required whenever the column is from a different table than the current table. Table names must be unique within the database. • Table names must be enclosed in single quotation marks if they contain spaces, other special characters or any non-English alphanumeric characters. Measures • Measure names must always be in brackets. • Measure names can contain spaces. • Each measure name must be unique within a database. Therefore, the table name is optional in front of a measure name when referencing an existing measure. However, when you create a measure you must always specify a table where the measure definition will be stored. Columns Column names must be unique in the context of a table; however, multiple tables can have columns with the same names (disambiguation comes with the table name). In general, columns can be referenced without referencing the base table that they belong to, except when there might be a name conflict to resolve or with certain functions that require column names to be fully qualified. Reserved Keywords If the name that you use for a table is the same as an Analysis Services reserved keyword, an error is raised, and you must rename the table. However, you can use keywords in object names if the object name is enclosed in brackets (for columns) or quotation marks (for tables). Note Note that quotation marks can be represented by several different characters, depending on the application. If you paste formulas from an external document or Web page, make sure to check the ASCII code of the character that is used for opening and closing quotes, to ensure that they are the same. Otherwise DAX 11 may be unable to recognize the symbols as quotation marks, making the reference invalid. Special Characters The following characters and character types are not valid in the names of tables, columns, or measures: • Leading or trailing spaces; unless the spaces are enclosed by name delimiters, brackets, or single apostrophes. • Control characters • The following characters that are not valid in the names of PowerPivot objects: .,;':/\*|?&%$!+=()[]{}<> Examples of Object Names The following table shows examples of some object names: Object Types Examples Comment Table name Sales If the table name does not contain spaces or other special characters, the name does not need to be enclosed in quotation marks. Table name ‘Canada Sales’ If the name contains spaces, tabs or other special characters, enclose the name in single quotation marks. Fully qualified column name Sales[Amount] The table name precedes the column name, and the column name is enclosed in brackets. Fully qualified measure name Sales[Profit] The table name precedes the measure name, and the measure name is enclosed in brackets. In certain contexts, a fully qualified name is always required. Unqualified column name [Amount] The unqualified name is just 12 the column name, in brackets. Contexts where you can use the unqualified name include formulas in a calculated column within the same table, or in an aggregation function that is scanning over the same table. Fully qualified column in table with spaces ‘Canada Sales’[Qty] The table name contains spaces, so it must be surrounded by single quotes. Note To make it easier to enter the fully qualified names of columns, we recommend that you use the AutoComplete feature when building formulas. For more information, see Building Formulas for Calculated Columns and Measures. Miscellaneous Restrictions The syntax required for each function, and the type of operation it can perform, varies greatly depending on the function. In general, however, the following rules apply to all formulas and expressions: • DAX formulas and expressions cannot modify or insert individual values in tables. • You cannot create calculated rows by using DAX. You can create only calculated columns and measures. • When defining calculated columns, you can nest functions to any level. • DAX has several functions that return a table. Typically, you use the values returned by these functions as input to other functions, which require a table as input. Functions in DAX DAX provides the following types of functions. • Date and Time Functions • Filter Functions • Information Functions • Logical Functions • Math and Trigonometric Functions • Statistical Functions 13 • Text Functions DAX Operators and Constants The following table lists the operators that are supported by DAX. In general, operators in DAX behave the same way that they do in Microsoft Excel, with some minor exceptions. For more information about the syntax of individual operators, see Operator Reference. Operator Type Symbol and Use Parenthesis operator () precedence order and grouping of arguments Arithmetic operators + (addition) - (subtraction/ sign) * (multiplication) / (division) ^ (exponentiation) Comparison operators = (equal to) > (greater than) < (less than) >= (greater than or equal to) <= (less than or equal to) <> (not equal to) Text concatenation operator & (concatenation) Logic operators && (and) || (or) Data Types in DAX You do not need to cast, convert, or otherwise specify the data type of a column or value that you use in a DAX formula. When you use data in a DAX formula, DAX automatically identifies the data types in referenced columns and of the values that you type in, and performs implicit conversions where necessary to complete the specified operation. For example, if you try to add a number to a date value, PowerPivot will interpret the operation in the context of the function, like Excel does, and convert the numbers to a common data type, and then present the result in the intended format, a date. 14 However, there are some limitations on the values that can be successfully converted. If a value or a column has a data type that is incompatible with the current operation, DAX returns an error. Also, DAX does not provide functions that let you explicitly change, convert, or cast the data type of existing data that you have imported into a PowerPivot workbook. Important PowerPivot does not support use of the variant data type used in Excel. Therefore, when you load or import data, it is expected that the data in each column is generally of a consistent data type. Some functions return scalar values, including strings, whereas other functions work with numbers, both integers and real numbers, or dates and times. The data type required for each function is described in the section, Function Reference. Tables are a new data type in PowerPivot. You can use tables containing multiple columns and multiple rows of data as the argument to a function. Some functions also return tables, which are stored in memory and can be used as arguments to other functions. For more information about the different numeric and date/time data types, and for details on the handling of nulls and empty strings, see Data Types Supported in PowerPivot Workbooks. See Also Build a formula DAX Operator Reference for PowerPivot The Data Analysis Expression (DAX) language uses operators to create expressions that compare values, perform arithmetic calculations, or work with strings. This section describes the use of each operator. Types of Operators There are four different types of calculation operators: arithmetic, comparison, text concatenation, and logical. Arithmetic Operators To perform basic mathematical operations such as addition, subtraction, or multiplication; combine numbers; and produce numeric results, use the following arithmetic operators. 15 Arithmetic operator Meaning Example + (plus sign) Addition 3+3 – (minus sign) Subtraction or sign 3–1–1 * (asterisk) Multiplication 3*3 / (forward slash) Division 3/3 ^ (caret) Exponentiation 16^4 Note The plus sign can function both as a binary operator and as a unary operator. A binary operator requires numbers on both sides of the operator and performs addition. When you use values in a DAX formula on both sides of the binary operator, DAX tries to cast the values to numeric data types if they are not already numbers. In contrast, the unary operator can be applied to any type of argument. The plus symbol does not affect the type or value and is simply ignored, whereas the minus operator creates a negative value, if applied to a numeric value. Comparison Operators You can compare two values with the following operators. When two values are compared by using these operators, the result is a logical value, either TRUE or FALSE. Comparison operator Meaning Example = Equal to [Region] = "USA" > Greater than [Sales Date] > "Jan 2009" < Less than [Sales Date] < "Jan 1 2009" >= Greater than or equal to [Amount] >= 20000 <= Less than or equal to [Amount] <= 100 <> Not equal to [Region] <> "USA" Text Concatenation Operator Use the ampersand (&) to join, or concatenate, two or more text strings to produce a single piece of text. 16 Text operator Meaning Example & (ampersand) Connects, or concatenates, two values to produce one continuous text value [Region] & ", " & [City] Logical Operators Use logical operators (&&) and (||) to combine expressions to produce a single result. Text operator Meaning Examples && (double ampersand) Creates an AND condition between two expressions that each have a Boolean result. If both expressions return TRUE, the combination of the expressions also returns TRUE; otherwise the combination returns FALSE. ([Region] = "France") && ([BikeBuyer] = "yes")) || (double pipe symbol) Creates an OR condition (([Region] = "France") || ([BikeBuyer] = "yes")) between two logical expressions. If either expression returns TRUE, the result is TRUE; only when both expressions are FALSE is the result FALSE. Operators and Precedence Order In some cases, the order in which calculation is performed can affect the return value; therefore, it is important to understand how the order is determined and how you can change the order to obtain the desired results. Calculation Order An expression evaluates the operators and values in a specific order. All expressions always begin with an equal sign (=). The equal sign indicates that the succeeding characters constitute an expression. 17 Following the equal sign are the elements to be calculated (the operands), which are separated by calculation operators. Expressions are always read from left to right, but the order in which the elements are grouped can be controlled to some degree by using parentheses. Operator Precedence If you combine several operators in a single formula, the operations are ordered according to the following table. If the operators have equal precedence value, they are ordered from left to right. For example, if an expression contains both a multiplication and division operator, they are evaluated in the order that they appear in the expression, from left to right. Operator Description ^ Exponentiation – Sign (as in –1) * and / Multiplication and division ! NOT (unary operator) + and – Addition and subtraction & Connects two strings of text (concatenation) =< ><=>=<> Comparison Using Parentheses to Control Calculation Order To change the order of evaluation, you should enclose in parentheses that part of the formula that must be calculated first. For example, the following formula produces 11 because multiplication is calculated before addition. The formula multiplies 2 by 3, and then adds 5 to the result. =5+2*3 In contrast, if you use parentheses to change the syntax, the order is changed so that 5 and 2 are added together, and the result multiplied by 3 to produce 21. =(5+2)*3 In the following example, the parentheses around the first part of the formula force the calculation to evaluate the expression (3 + 0.25) first and then divide the result by the result of the expression, (3 - 0.25). =(3 + 0.25)/(3 - 0.25) 18 In the following example, the exponentiation operator is applied first, according to the rules of precedence for operators, and then the sign operator is applied. The result for this expression is -4. =-2^2 To ensure that the sign operator is applied to the numeric value first, you can use parentheses to control operators, as shown in the following example. The result for this expression is 4. = (-2)^2 Compatibility Notes DAX easily handles and compares various data types, much like Microsoft Excel. However, the underlying computation engine is based on SQL Server Analysis Services and provides additional advanced features of a relational data store, including richer support for date and time types. Therefore, in some cases the results of calculations or the behavior of functions may not be the same as in Excel. Moreover, DAX supports more data types than does Excel. This section describes the key differences. Coercing Data Types of Operands In general, the two operands on the left and right sides of any operator should be the same data type. However, if the data types are different, DAX will convert them to a common data type for comparison, as follows: 1. First, both operands are converted to the largest possible common data type. 2. Next, the operands are compared. For example, suppose you have two numbers that you want to combine. One number results from a formula, such as =[Price] * .20, and the result may contain many decimal places. The other number is an integer that has been provided as a string value. In this case, DAX will convert both numbers to real numbers in a numeric format, using the largest numeric format that can store both kinds of numbers. Then DAX will compare the values. In contrast, Excel tries to compare values of different types without first coercing them to a common type. For this reason, you may see different results in DAX than in Excel for the same comparison expression. Data Types used in DAX Data Types used in Excel Numbers (I8, R8) Numbers (R8) Boolean Boolean String String DateTime Variant 19 Data Types used in DAX Data Types used in Excel Currency Currency For more information about implicit data type conversion, see Data Types Supported in PowerPivot Workbooks. Differences in Precedence Order The precedence order of operations in DAX formulas is basically the same as that used by Microsoft Excel, but some Excel operators are not supported, such as percent. Also, ranges are not supported. Therefore, whenever you copy and paste formulas from Excel, be sure to review the formula carefully, as some operators or elements in the formulas may not be valid. When there is any doubt about the order in which operations are performed, we recommend that you use parentheses to control the order of operations and remove any ambiguity about the result. See Also Basic DAX Syntax Using Data Analysis Expressions Parameter-Naming Conventions Parameter names are standardized in DAX reference to facilitate the usage and understanding of the functions. Parameter Names Parameter Description expression Any DAX expression that returns a single scalar value, where the expression is to be evaluated multiple times (for each row/context). value Any DAX expression that returns a single scalar value where the expression is to be evaluated exactly once before all other operations. table Any DAX expression that returns a table of 20 data. tableName The name of an existing table using standard DAX syntax. It cannot be an expression. columnName The name of an existing column using standard DAX syntax, usually fully qualified. It cannot be an expression. name A string constant that will be used to provide the name of a new object. order An enumeration used to determine the sort order. ties An enumeration used to determine the handling of tie values. type An enumeration used to determine the data type for PathItem and PathItemReverse. Prefixing parameter names or using the prefix only prefixing Parameter names may be further qualified with a prefix that is descriptive of how the argument is used and to avoid ambiguous reading of the parameters. For example: Result_ColumnName Refers to an existing column used to get the result values in the LOOKUPVALUE() function. Search_ColumnName Refers to an existing column used to search for a value in the 21 LOOKUPVALUE() function. omitting Parameter names will be omitted if the prefix is clear enough to describe the parameter. For example, instead of having the following syntax DATE (Year_Value, Month_Value, Day_Value) it is clearer for the user to read DATE (Year, Month, Day); repeating three times the suffix value does not add anything to a better comprehension of the function and it clutters the reading unnecessarily. However, if the prefixed parameter is Year_columnName then the parameter name and the prefix will stay to make sure the user understands that the parameter requires a reference to an existing column of Years. Understanding Functions for Parent-Child Hierarchies in DAX DAX provides five functions to help users manage data that is presented as a parentchild hierarchy in their models. With this functions a user can obtain the entire lineage of parents a row has, how many levels has the lineage to the top parent, who is the parent n-levels above the current row, who is the n-descendant from the top of the current row hierarchy and is certain parent a parent in the current row hierarchy? Parent-Child functions in DAX The following table contains a Parent-Child hierarchy on the columns: EmployeeKey and ParentEmployeeKey that is used in all the functions examples. EmployeeKey ParentEmployeeKey 22 112 14 112 3 14 11 3 13 3 162 3 117 162 221 162 81 162 In the above table you can see that employee 112 has no parent defined, employee 14 has employee 112 as manager (ParentEmployeeKey), employee 3 has employee 14 as manager and employees 11, 13, and 162 have employee 3 as manager. The above helps to understand that employee 112 has no manager above her/him and she/he is the top manager for all employees shown here; also, employee 3 reports to employee 14 and employees 11, 13, 162 report to 3. The following table presents the available functions, a brief description of the function and an example of the function over the same data shown above. Function Description / Example PATH Function (DAX) Returns a delimited text with the identifiers of all the parents to the current row, starting with the oldest or top most until current. In the following example column ‘Path’ is defined as '=PATH(EmployeeKey, ParentEmployeeKey)' EmployeeKey ParentEmployeeKey 112 Path 112 14 112 112|14 3 14 112|14|3 11 3 112|14|3|11 13 3 112|14|3|13 162 3 112|14|3|162 23 Function PATHLENGTH Function (DAX) Description / Example 117 162 112|14|3|162|117 221 162 112|14|3|162|221 81 162 112|14|3|162|81 Returns the number of levels in a given PATH(), starting at current level until the oldest or top most parent level. In the following example column PathLength is defined as ‘=PATHLENGTH([Path])’; the example includes all data from the Path() example to help understand how this function works. EmployeeKey ParentEmployeeKey 112 PATHITEM Function (DAX) Path PathLength 112 1 14 112 112|14 2 3 14 112|14|3 3 11 3 112|14|3|11 4 13 3 112|14|3|13 4 162 3 112|14|3|162 4 117 162 112|14|3|162|117 5 221 162 112|14|3|162|221 5 81 162 112|14|3|162|81 5 Returns the item at the specified position from a PATH() like result, counting from left to right. In the following example column PathItem - 4th from left is defined as ‘=PATHITEM([Path], 4)’; this example returns the EmployeKey at fourth position in the Path string from the left, using the same sample data from the Path() example. 24 Function Description / Example EmployeeKey ParentEmployeeKey Path PathItem 4th from left 112 112 14 112 112|14 3 14 112|14|3 11 3 112|14|3|11 11 13 3 112|14|3|13 13 162 3 112|14|3|162 162 117 162 112|14|3|162|117 162 221 162 112|14|3|162|221 162 81 162 112|14|3|162|81 162 PATHITEMREVERS Returns the item at position from a PATH() like function result, E Function (DAX) counting backwards from right to left. In the following example column PathItemReverse - 3rd from right is defined as ‘=PATHITEMREVERSE([Path], 3)’; this example returns the EmployeKey at third position in the Path string from the right, using the same sample data from the Path() example. EmployeeKey ParentEmployeeKey Path PathItemReverse - 3rd from right 112 112 14 112 112|14 3 14 112|14|3 112 11 3 112|14|3|11 14 13 3 112|14|3|13 14 162 3 112|14|3|162 14 117 162 112|14|3|162|117 3 25 Function PATHCONTAINS Function (DAX) Description / Example 221 162 112|14|3|162|221 3 81 162 112|14|3|162|81 3 Returns TRUE if the specified item exists within the specified path. In the following example column PathContains - employee 162 is defined as ‘=PATHCONTAINS([Path], "162")’; this example returns TRUE if the given path contains employee 162. This example uses the results from the Path() example above. EmployeeKe y ParentEmployeeKe Path y 112 PathContain semployee 162 112 FALSE 14 112 112|14 FALSE 3 14 112|14|3 FALSE 11 3 112|14|3|11 FALSE 13 3 112|14|3|13 FALSE 162 3 112|14|3|162 TRUE 117 162 112|14|3|162|11 7 TRUE Warning In SQL Server 2012 Analysis Services, the xVelocity in-memory analytics engine (VertiPaq) does not support the definition of parent-child hierarchies; however, the DAX language provides a set of functions that allows users to explore parentchild hierarchies and to use these hierarchies in formulas. 26 DAX Function Reference This section provides detailed syntax for the functions and operators used in Data Analysis Expression formulas, together with examples. For general information about DAX, see DAX Reference. In this Section DAX Table Queries Date and Time Functions (DAX) Filter Functions (DAX) Information Functions (DAX) Logical Functions (DAX) Math and Trigonometric Functions (DAX) Statistical Functions (DAX) Text Functions (DAX) See Also Operator Reference (DAX) DAX Syntax Specification DAX Queries The DAX language offers a new syntax to return table data from a query. In this Section In this section you will find: Table Query syntax reference Parameters for Table Queries Reference • Execute Method (XMLA) • Statement Element (XMLA) Related Sections 27 DAX Query Syntax Reference DAX queries allow the user to retrieve data defined by a table expression from the xVelocity in-memory analytics engine (VertiPaq). The user can create measures as part of the query; these measures exist only for the duration of the query. Syntax [DEFINE { MEASURE <tableName>[<name>] = <expression> } EVALUATE <table> [ORDER BY {<expression> [{ASC | DESC}]}[, …] [START AT {<value>|<parameter>} [, …]]] Parameters Parameter Description DEFINE clause An optional clause of the query statement that allows the user to define measures for the duration of the query. Definitions can reference other definitions that appear before or after the current definition. tableName The name of an existing table using standard DAX syntax. It cannot be an expression. name The name of a new measure. It cannot be an expression. expression Any DAX expression that returns a single scalar value. EVALUATE clause Contains the table expression that generates the results of the query. The expression can use any of the defined measures. The expression must return a table. If a scalar value is required, the person authoring the measure can wrap their scalar inside a ROW() function to produce a table that contains the required scalar. ORDER BY clause Optional clause that defines the expression(s) used to sort the query results. Any expression that can be evaluated for each row of the result is valid. START AT sub-clause Optional clause, inside an ORDER BY clause, that defines the values at which the query 28 results will start. The START AT clause is part of the ORDER BY clause and cannot be used outside it. In an ordered set of results, the START AT clause defines the starting row for the result set. The START AT arguments have a one to one correspondence with the columns in the ORDER BY clause; there can be as many arguments in the START AT clause as there are in the ORDER BY clause, but not more. The first argument in the START AT defines the starting value in column 1 of the ORDER BY columns. The second argument in the START AT defines the starting value in column 2 of the ORDER BY columns within the rows that meet the first value for column 1. value A constant value; it cannot be an expression. parameter The name of a parameter in the XMLA statement prefixed with an @ character. For more information, see Parameters Queries. for DAX Return Value A table of data. Code Examples For examples of using DAX queries, see this site. Parameters for DAX Queries This topic illustrates how to pass parameter values in an XMLA structure to a DAX query statement. Parameters in XMLA and DAX queries A well-defined DAX query statement would benefit enormously by being able to be parameterized and then used, over and over, with just changes in the parameter values. The Execute method, in XMLA, has a Parameters collection element that allows parameters to be defined and assigned a value; within the collection, each Parameter element defines the name of the parameter and a value to it. The DAX query syntax allows you to reference XMLA parameters by prefixing the name, of the parameter, with an @ character. Hence, any place in the syntax where a value is 29 allowed it can be replaced with a parameter call. However, one thing needs to be remembered: all XMLA parameters are typed as text. Warning Parameters defined in the parameters section and not used in the <STATEMENT> element generate an error response in XMLA. Warning Parameters used and not defined in the <Parameters> element generate an error response in XMLA. Code Examples For examples of using DAX queries, see this site. Date and Time Functions Many of the date and time functions in DAX are very similar to the Excel date and time functions. However, DAX functions use a datetime data type, and can take values from a column as an argument. DAX also includes a set of time intelligence functions that enable you to manipulate data using time periods, including days, months, quarters, and years, and then build and compare calculations over those periods. In this Section Time Intelligence Functions (DAX) DATE Function DATEVALUE Function (DAX) DAY Function EDATE Function EOMONTH Function HOUR Function MINUTE Function MONTH Function NOW Function SECOND Function TIME Function (DAX) TIMEVALUE Function (DAX) TODAY Function WEEKDAY Function WEEKNUM Function YEAR Function 30 YEARFRAC Function Reference Using DAX Basic DAX Syntax Related Sections Date and Time Functions (DAX) Aggregation Functions (DAX) Logical Functions (DAX) Filter and Value Functions (DAX) Math and Trigonometric Functions (DAX) See Also Getting Started with Data Analysis Expressions (DAX) Time Intelligence Functions Data Analysis Expressions (DAX) includes time intelligence functions to support the needs of Business Intelligence analysis by enabling you to manipulate data using time periods, including days, months, quarters, and years, and then build and compare calculations over those periods. The following time intelligence functions are available in DAX. In this Section CLOSINGBALANCEMONTH Function (DAX) CLOSINGBALANCEQUARTER Function (DAX) CLOSINGBALANCEYEAR Function (DAX) DATEADD Function (DAX) DATESBETWEEN Function (DAX) DATESINPERIOD Function (DAX) DATESMTD Function (DAX) DATESQTD Function (DAX) DATESYTD Function (DAX) ENDOFMONTH Function (DAX) ENDOFQUARTER Function (DAX) ENDOFYEAR Function (DAX) FIRSTDATE Function (DAX) FIRSTNONBLANK Function (DAX) LASTDATE Function (DAX) 31 LASTNONBLANK Function (DAX) NEXTDAY Function (DAX) NEXTMONTH Function (DAX) NEXTQUARTER Function (DAX) NEXTYEAR Function (DAX) OPENINGBALANCEMONTH Function (DAX) OPENINGBALANCEQUARTER Function (DAX) OPENINGBALANCEYEAR Function (DAX) PARALLELPERIOD Function (DAX) PREVIOUSDAY Function (DAX) PREVIOUSMONTH Function (DAX) PREVIOUSQUARTER Function (DAX) PREVIOUSYEAR Function (DAX) SAMEPERIODLASTYEAR Function (DAX) STARTOFMONTH Function (DAX) STARTOFQUARTER Function (DAX) STARTOFYEAR Function (DAX) TOTALMTD Function (DAX) TOTALQTD Function (DAX) TOTALYTD Function (DAX) See Also Function Reference (DAX) Date and Time Functions (DAX) Filter and Value Functions (DAX) Information Functions (DAX) Logical Functions (DAX) Math and Trigonometric Functions (DAX) Statistical Functions (DAX) Text Functions (DAX) CLOSINGBALANCEMONTH Function Evaluates the expression at the last date of the month in the current context. Syntax CLOSINGBALANCEMONTH(<expression>,<dates>[,<filter>]) 32 Parameters Parameter Definition expression An expression that returns a scalar value. dates A column that contains dates. filter (optional) An expression that specifies a filter to apply to the current context. Return Value A scalar value that represents the expression evaluated at the last date of the month in the current context. Remarks Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values. • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). Note The filter expression has restrictions described in the topic, CALCULATE Function (DAX). This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example The following sample formula creates a measure that calculates the 'Month End Inventory Value' of the product inventory. To see how this works, create a PivotTable and add the fields, CalendarYear, MonthNumberOfYear and DayNumberOfMonth, to the Row Labels area of the PivotTable. Then add a measure, named Month End Inventory Value, using the formula defined in the code section, to the Values area of the PivotTable. 33 Code =CLOSINGBALANCEMONTH(SUMX(ProductInventory,ProductInventory[UnitCost]*P roductInventory[UnitsBalance]),DateTime[DateKey]) See Also Time intelligence functions CLOSINGBALANCEYEAR CLOSINGBALANCEQUARTER Get Sample Data CLOSINGBALANCEQUARTER Function Evaluates the expression at the last date of the quarter in the current context. Syntax CLOSINGBALANCEQUARTER(<expression>,<dates>[,<filter>]) Parameters Parameter Definition expression An expression that returns a scalar value. dates A column that contains dates. filter (optional) An expression that specifies a filter to apply to the current context. Return Value A scalar value that represents the expression evaluated at the last date of the quarter in the current context. Remarks Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values. • A Boolean expression that defines a single-column table of date/time values. Note 34 Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). Note The filter expression has restrictions described in the topic, CALCULATE Function (DAX). This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example The following sample formula creates a measure that calculates the 'Quarter End Inventory Value' of the product inventory. To see how this works, create a PivotTable and add the fields, CalendarYear, CalendarQuarter and MonthNumberOfYear, to the Row Labels area of the PivotTable. Then add a measure, named Quarter End Inventory Value, using the formula defined in the code section, to the Values area of the PivotTable. Code =CLOSINGBALANCEQUARTER(SUMX(ProductInventory,ProductInventory[UnitCost] *ProductInventory[UnitsBalance]),DateTime[DateKey]) See Also Time intelligence functions CLOSINGBALANCEYEAR CLOSINGBALANCEMONTH Get Sample Data CLOSINGBALANCEYEAR Function Evaluates the expression at the last date of the year in the current context. Syntax CLOSINGBALANCEYEAR(<expression>,<dates>[,<filter>][,<year_end_date>]) Parameters Parameter Definition expression An expression that returns a scalar value. dates A column that contains dates. filter (optional) An expression that specifies a filter to apply to the current context. 35 year_end_date (optional) A literal string with a date that defines the year-end date. The default is December 31. Return Value A scalar value that represents the expression evaluated at the last date of the year in the current context. Remarks Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values. • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). Note The filter expression has the restrictions described in the topic, CALCULATE Function (DAX). The year_end_date parameter is a string literal of a date, in the same locale as the locale of the client where the workbook was created. The year portion of the date is ignored. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example The following sample formula creates a measure that calculates the 'Year End Inventory Value' of the product inventory. To see how this works, create a PivotTable and add the field, CalendarYear, to the Row Labels area of the PivotTable. Then add a measure, named Year End Inventory Value, using the formula defined in the code section, to the Values area of the PivotTable. Code =CLOSINGBALANCEYEAR(SUMX(ProductInventory,ProductInventory[UnitCost]*Pr oductInventory[UnitsBalance]),DateTime[DateKey]) See Also 36 Time intelligence functions CLOSINGBALANCEYEAR CLOSINGBALANCEQUARTER CLOSINGBALANCEMONTH Get Sample Data DATEADD Function Returns a table that contains a column of dates, shifted either forward or backward in time by the specified number of intervals from the dates in the current context. Syntax DATEADD(<dates>,<number_of_intervals>,<interval>) Parameters Term Definition dates A column that contains dates. number_of_intervals An integer that specifies the number of intervals to add to or subtract from the dates. interval The interval by which to shift the dates. The value for interval can be one of the following: year, quarter, month, day Return Value A table containing a single column of date values. Remarks Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column, • A table expression that returns a single column of date/time values, • A Boolean expression that defines a single-column table of date/time values. Note 37 Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). If the number specified for number_of_intervals is positive, the dates in dates are moved forward in time; if the number is negative, the dates in dates are shifted back in time. The interval parameter is an enumeration, not a set of strings; therefore values should not be enclosed in quotation marks. Also, the values: year, quarter, month, day should be spelled in full when using them. The result table includes only dates that exist in the dates column. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example: Shifting a Set of Dates Description The following formula calculates dates that are one year before the dates in the current context. Code =DATEADD(DateTime[DateKey],-1,year) See Also Time intelligence functions Date and time functions Get Sample Data DATESBETWEEN Function Returns a table that contains a column of dates that begins with the start_date and continues until the end_date. Syntax DATESBETWEEN(<dates>,<start_date>,<end_date>) Parameters Term Definition dates A reference to a date/time column. start_date A date expression. end_date A date expression. 38 Return Value A table containing a single column of date values. Remarks If start_date is a blank date value, then start_date will be the earliest value in the dates column. If end_date is a blank date value, then end_date will be the latest value in the dates column. The dates used as the start_date and end_date are inclusive: that is, if the sales occurred on September 1 and you use September 1 as the start date, sales on September 1 are counted. Note The DATESBETWEEN function is provided for working with custom date ranges. If you are working with common date intervals such as months, quarters, and years, we recommend that you use the appropriate function, such as DATESINPERIOD. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following sample formula creates a measure that calculates the 'Summer 2007 sales' for the Internet sales. To see how this works, create a PivotTable and add the field, CalendarYear, to the Row Labels area of the PivotTable. Then add a measure, named Summer 2007 Sales, using the formula as defined in the code section, to the Values area of the PivotTable. Code =CALCULATE(SUM(InternetSales_USD[SalesAmount_USD]), DATESBETWEEN(DateTime[DateKey], DATE(2007,6,1), DATE(2007,8,31) )) See Also Time intelligence functions Date and time functions DATESINPERIOD 39 DATESINPERIOD Function Returns a table that contains a column of dates that begins with the start_date and continues for the specified number_of_intervals. Syntax DATESINPERIOD(<dates>,<start_date>,<number_of_intervals>,<interval>) Parameters Term Definition dates A column that contains dates. start_date A date expression. number_of_intervals An integer that specifies the number of intervals to add to or subtract from the dates. interval The interval by which to shift the dates. The value for interval can be one of the following: year, quarter, month, day Return Value A table containing a single column of date values. Remarks Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column, • A table expression that returns a single column of date/time values, • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). If the number specified for number_of_intervals is positive, the dates are moved forward in time; if the number is negative, the dates are shifted back in time. 40 The interval parameter is an enumeration, not a set of strings; therefore values should not be enclosed in quotation marks. Also, the values: year, quarter, month, day should be spelled in full when using them. The result table includes only dates that appear in the values of the underlying table column. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following formula returns the Internet sales for the 21 days prior to August 24, 2007. Code = CALCULATE(SUM(InternetSales_USD[SalesAmount_USD]),DATESINPERIOD(DateTim e[DateKey],DATE(2007,08,24),-21,day)) See Also Time intelligence functions Date and time functions DATESBETWEEN Get Sample Data DATESMTD Function Returns a table that contains a column of the dates for the month to date, in the current context. Syntax DATESMTD(<dates>) Parameters Term Definition dates A column that contains dates. Property Value/Return Value A table containing a single column of date values. Remarks 41 Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values. • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following sample formula creates a measure that calculates the 'Month To Date Total' for the Internet sales. To see how this works, create a PivotTable and add the fields, CalendarYear, MonthNumberOfYear and DayNumberOfMonth, to the Row Labels area of the PivotTable. Then add a measure, named Month To Date Total, using the formula defined in the code section, to the Values area of the PivotTable. Code =CALCULATE(SUM(InternetSales_USD[SalesAmount_USD]), DATESMTD(DateTime[DateKey])) See Also Time intelligence functions Date and time functions DATESYTD DATESQTD Get Sample Data DATESQTD Function Returns a table that contains a column of the dates for the quarter to date, in the current context. Syntax DATESQTD(<dates>) 42 Parameters Term Definition dates A column that contains dates. Property Value/Return Value A table containing a single column of date values. Remarks Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values. • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following sample formula creates a measure that calculates the 'Quarterly Running Total' of the internet sales. To see how this works, create a PivotTable and add the fields, CalendarYear, CalendarQuarter and MonthNumberOfYear to the Row Labels area of the PivotTable. Then add a measure, named Quarterly Running Total, using the formula defined in the code section, to the Values area of the PivotTable. Code =CALCULATE(SUM(InternetSales_USD[SalesAmount_USD]), DATESQTD(DateTime[DateKey])) See Also Time intelligence functions Date and time functions DATESYTD 43 DATESMTD Get Sample Data DATESYTD Function Returns a table that contains a column of the dates for the year to date, in the current context. Syntax DATESYTD(<dates> [,<year_end_date>]) Parameters Term Definition dates A column that contains dates. year_end_date (optional) A literal string with a date that defines the year-end date. The default is December 31. Property Value/Return Value A table containing a single column of date values. Remarks Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column, • A table expression that returns a single column of date/time values, • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). The year_end_date parameter is a string literal of a date, in the same locale as the locale of the client where the workbook was created. The year portion of the date is ignored. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. 44 Example Description The following sample formula creates a measure that calculates the 'Running Total' for the Internet sales. To see how this works, create a PivotTable and add the fields, CalendarYear and CalendarQuarter, to the Row Labels area of the PivotTable. Then add a measure named Running Total, using the formula defined in the code section, to the Values area of the PivotTable. Code =CALCULATE(SUM(InternetSales_USD[SalesAmount_USD]), DATESYTD(DateTime[DateKey])) See Also Time intelligence functions Date and time functions DATESMTD DATESQTD Get Sample Data ENDOFMONTH Function Returns the last date of the month in the current context for the specified column of dates. Syntax ENDOFMONTH(<dates>) Parameters Term Definition dates A column that contains dates. Return Value A table containing a single column and single row with a date value. Remarks Note To understand more about how context affects the results of formulas, see Context. 45 The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values. • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following sample formula creates a measure that returns the end of the month, for the current context. To see how this works, create a PivotTable and add the fields CalendarYear and MonthNumberOfYear to the Row Labels area of the PivotTable. Then add a measure, named EndOfMonth, using the formula defined in the code section, to the Values area of the PivotTable. Code =ENDOFMONTH(DateTime[DateKey]) See Also Date and time functions time intelligence functions endofyear endofquarter ENDOFQUARTER Function Returns the last date of the quarter in the current context for the specified column of dates. Syntax ENDOFQUARTER(<dates>) Parameters Term Definition dates A column that contains dates. 46 Return Value A table containing a single column and single row with a date value. Remarks Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column, • A table expression that returns a single column of date/time values, • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following sample formula creates a measure that returns the end of the quarter, for the current context. To see how this works, create a PivotTable and add the fields CalendarYear and MonthNumberOfYear to the Row Labels area of the PivotTable. Then add a measure, named EndOfQuarter, using the formula defined in the code section, to the Values area of the PivotTable. Code =ENDOFQUARTER(DateTime[DateKey]) See Also Date and time functions time intelligence functions endofyear endofmonth ENDOFYEAR Function Returns the last date of the year in the current context for the specified column of dates. Syntax 47 ENDOFYEAR(<dates> [,<year_end_date>]) Parameters Term Definition dates A column that contains dates. year_end_date (optional) A literal string with a date that defines the year-end date. The default is December 31. Return Value A table containing a single column and single row with a date value. Remarks Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column, • A table expression that returns a single column of date/time values, • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). The year_end_date parameter is a string literal of a date, in the same locale as the locale of the client where the workbook was created. The year portion of the date is ignored. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following sample formula creates a measure that returns the end of the fiscal year that ends on June 30, for the current context. To see how this works, create a PivotTable and add the field CalendarYear to the Row Labels area of the PivotTable. Then add a measure, named EndOfFiscalYear, using the formula defined in the code section, to the Values area of the PivotTable. Code 48 =ENDOFYEAR(DateTime[DateKey],"06/30/2004") See Also Date and time functions time intelligence functions endofmonth endofquarter FIRSTDATE Function Returns the first date in the current context for the specified column of dates. Syntax FIRSTDATE(<dates>) Parameters Term Definition dates A column that contains dates. Return Value A table containing a single column and single row with a date value. Remarks Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values,. • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). When the current context is a single date, the date returned by the FIRSTDATE and LASTDATE functions will be equal. Technically, the return value is a table that contains a single column and single value. Therefore, this function can be used as an argument to any function that requires a table in its arguments. Also, the returned value can be used whenever a date value is required. 49 This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following sample formula creates a measure that obtains the first date when a sale was made in the Internet sales channel for the current context. To see how this works, create a PivotTable and add the field CalendarYear to the Row Labels area of the PivotTable. Then add a measure, named FirstSaleDate, using the formula defined in the code section, to the Values area of the PivotTable. Code =FIRSTDATE('InternetSales_USD'[SaleDateKey]) See Also Date and time functions Time Intelligence functions LASTDATE FIRSTNONBLANKDATE Get Sample Data FIRSTNONBLANK Function Returns the first value in the column, column, filtered by the current context, where the expression is not blank. Syntax FIRSTNONBLANK(<column>,<expression>) Parameters Term Definition column A column expression. expression An expression evaluated for blanks for each value of column. Property Value/Return Value A table containing a single column and single row with the computed first value. Remarks The column argument can be any of the following: 50 • A reference to any column. • A table with a single column. • A Boolean expression that defines a single-column table . Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). This function is typically used to return the first value of a column for which the expression is not blank. For example, you could get the last value for which there were sales of a product. Note To understand more about how context affects the results of formulas, see Context. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. See Also LASTNONBLANK Function (DAX) Statistical Functions (DAX) Function Reference (DAX) Context in DAX Formulas Working with Relationships in Formulas Get Sample Data LASTDATE Function Returns the last date in the current context for the specified column of dates. Syntax LASTDATE(<dates>) Parameters Term Definition dates A column that contains dates. Return Value A table containing a single column and single row with a date value. 51 Remarks Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column, • A table expression that returns a single column of date/time values, • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). When the current context is a single date, the date returned by the FIRSTDATE and LASTDATE functions will be equal. Technically, the return value is a table that contains a single column and single value. Therefore, this function can be used as an argument to any function that requires a table in its arguments. Also, the returned value can be used whenever a date value is required. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following sample formula creates a measure that obtains the last date, for the current context, when a sale was made in the Internet sales channel. To see how this works, create a PivotTable and add the field CalendarYear to the Row Labels area of the PivotTable. Then add a measure, named LastSaleDate, using the formula defined in the code section, to the Values area of the PivotTable. Code =LASTDATE('InternetSales_USD'[SaleDateKey]) See Also Date and time functions Time Intelligence functions FIRSTDATE LASTNONBLANKDATE Get Sample Data 52 LASTNONBLANK Function Returns the last value in the column, column, filtered by the current context, where the expression is not blank. Syntax LASTNONBLANK(<column>,<expression>) Parameters Term Definition column A column expression. expression An expression evaluated for blanks for each value of column. Property Value/Return Value A table containing a single column and single row with the computed last value. Remarks The column argument can be any of the following: • A reference to any column. • A table with a single column. • A Boolean expression that defines a single-column table Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). This function is typically used to return the last value of a column for which the expression is not blank. For example, you could get the last value for which there were sales of a product. Note To understand more about how context affects the results of formulas, see Context. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. See Also FIRSTNONBLANK Function (DAX) Statistical Functions (DAX) 53 Function Reference (DAX) Context in DAX Formulas Working with Relationships in Formulas Get Sample Data NEXTDAY Function Returns a table that contains a column of all dates from the next day, based on the first date specified in the dates column in the current context. Syntax NEXTDAY(<dates>) Parameters Term Definition dates A column containing dates. Return Value A table containing a single column of date values. Remarks Note To understand more about how context affects the results of formulas, see Context. This function returns all dates from the next day to the first date in the input parameter. For example, if the first date in the dates argument refers to June 10, 2009; then this function returns all dates equal to June 11, 2009. The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values. • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. 54 Example Description The following sample formula creates a measure that calculates the 'next day sales' of the internet sales. To see how this works, create a PivotTable and add the fields, CalendarYear and MonthNumberOfYear, to the Row Labels area of the PivotTable. Then add a measure, named Next Day Sales, using the formula defined in the code section, to the Values area of the PivotTable. Code =CALCULATE(SUM(InternetSales_USD[SalesAmount_USD]), NEXTDAY('DateTime'[DateKey])) See Also Time intelligence functions Date and time functions NEXTQUARTER NEXTMONTH NEXTYEAR Examples NEXTMONTH Function Returns a table that contains a column of all dates from the next month, based on the first date in the dates column in the current context. Syntax NEXTMONTH(<dates>) Parameters Term Definition dates A column containing dates. Return Value A table containing a single column of date values. Remarks Note 55 To understand more about how context affects the results of formulas, see Context. This function returns all dates from the next day to the first date in the input parameter. For example, if the first date in the dates argument refers to June 10, 2009; then this function returns all dates for the month of July, 2009. The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values. • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following sample formula creates a measure that calculates the 'next month sales' for the Internet sales. To see how this works, create a PivotTable and add the fields, CalendarYear and MonthNumberOfYear, to the Row Labels area of the PivotTable. Then add a measure, named Next Month Sales, using the formula defined in the code section, to the Values area of the PivotTable. Code =CALCULATE(SUM(InternetSales_USD[SalesAmount_USD]), NEXTMONTH('DateTime'[DateKey])) See Also Time intelligence functions Date and time functions NEXTDAY NEXTQUARTER NEXTYEAR Get Sample Data NEXTQUARTER Function Returns a table that contains a column of all dates in the next quarter, based on the first date specified in the dates column, in the current context. 56 Syntax NEXTQUARTER(<dates>) Parameters Term Definition dates A column containing dates. Return Value A table containing a single column of date values. Remarks Note To understand more about how context affects the results of formulas, see Context. This function returns all dates in the next quarter, based on the first date in the input parameter. For example, if the first date in the dates column refers to June 10, 2009, this function returns all dates for the quarter July to September, 2009. The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values. • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following sample formula creates a measure that calculates the 'next quarter sales' for the Internet sales. To see how this works, create a PivotTable and add the fields, CalendarYear and CalendarQuarter, to the Row Labels area of the PivotTable. Then add a measure, named Next Quarter Sales, using the formula defined in the code section to the Values area of the PivotTable. Code 57 =CALCULATE(SUM(InternetSales_USD[SalesAmount_USD]), NEXTQUARTER('DateTime'[DateKey])) See Also Time intelligence functions Date and time functions NEXTDAY NEXTMONTH NEXTYEAR Get Sample Data NEXTYEAR Function Returns a table that contains a column of all dates in the next year, based on the first date in the dates column, in the current context. Syntax NEXTYEAR(<dates>[,<year_end_date>]) Parameters Term Definition dates A column containing dates. year_end_date (optional) A literal string with a date that defines the year-end date. The default is December 31. Return Value A table containing a single column of date values. Remarks Note To understand more about how context affects the results of formulas, see Context. This function returns all dates in the next year, based on the first date in the input column. For example, if the first date in the dates column refers to the year 2007, this function returns all dates for the year 2008. The dates argument can be any of the following: • A reference to a date/time column. 58 • A table expression that returns a single column of date/time values. • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). The year_end_date parameter is a string literal of a date, in the same locale as the locale of the client where the workbook was created. The year portion of the date is ignored. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following sample formula creates a measure that calculates the 'next year sales' for the Internet sales. To see how this works, create a PivotTable and add the fields, CalendarYear and CalendarQuarter, to the Row Labels area of the PivotTable. Then add a measure, named Next Year Sales, using the formula defined in the code section, to the Values area of the PivotTable. Code =CALCULATE(SUM(InternetSales_USD[SalesAmount_USD]), NEXTYEAR('DateTime'[DateKey])) See Also Time intelligence functions Date and time functions NEXTDAY NEXTQUARTER NEXTMONTH Get Sample Data OPENINGBALANCEMONTH Function Evaluates the expression at the first date of the month in the current context. Syntax OPENINGBALANCEMONTH(<expression>,<dates>[,<filter>]) Parameters 59 Parameter Definition expression An expression that returns a scalar value. dates A column that contains dates. filter (optional) An expression that specifies a filter to apply to the current context. Return Value A scalar value that represents the expression evaluated at the first date of the month in the current context. Remarks Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values. • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). Note • The filter expression has restrictions described in the topic, CALCULATE Function (DAX). • This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example The following sample formula creates a measure that calculates the 'Month Start Inventory Value' of the product inventory. To see how this works, create a PivotTable and add the fields, CalendarYear, MonthNumberOfYear and DayNumberOfMonth, to the Row Labels area of the PivotTable. Then add a measure, named Month Start Inventory Value, using the formula defined in the code section, to the Values area of the PivotTable. Code 60 =OPENINGBALANCEMONTH(SUMX(ProductInventory,ProductInventory[UnitCost]*P roductInventory[UnitsBalance]),DateTime[DateKey]) See Also OPENINGBALANCEYEAR OPENINGBALANCEQUARTER Time Intelligence Functions closingbalancemonth Get Sample Data OPENINGBALANCEQUARTER Function Evaluates the expression at the first date of the quarter, in the current context. Syntax OPENINGBALANCEQUARTER(<expression>,<dates>[,<filter>]) Parameters Parameter Definition expression An expression that returns a scalar value. dates A column that contains dates. filter (optional) An expression that specifies a filter to apply to the current context. Return Value A scalar value that represents the expression evaluated at the first date of the quarter in the current context. Remarks Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values, • A Boolean expression that defines a single-column table of date/time values. Note 61 Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). Note • The filter expression has restrictions described in the topic, CALCULATE Function (DAX). • This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example The following sample formula creates a measure that calculates the 'Quarter Start Inventory Value' of the product inventory. To see how this works, create a PivotTable and add the fields, CalendarYear, CalendarQuarter and MonthNumberOfYear, to the Row Labels area of the PivotTable. Then add a measure, named Quarter Start Inventory Value, using the formula defined in the code section, to the Values area of the PivotTable. Code =OPENINGBALANCEQUARTER(SUMX(ProductInventory,ProductInventory[UnitCost] *ProductInventory[UnitsBalance]),DateTime[DateKey]) See Also OPENINGBALANCEYEAR OPENINGBALANCEMONTH Time Intelligence Functions closingbalancequarter Get Sample Data OPENINGBALANCEYEAR Function Evaluates the expression at the first date of the year in the current context. Syntax OPENINGBALANCEYEAR(<expression>,<dates>[,<filter>][,<year_end_date>]) Parameters Parameter Definition expression An expression that returns a scalar value. dates A column that contains dates. 62 filter (optional) An expression that specifies a filter to apply to the current context. year_end_date (optional) A literal string with a date that defines the year-end date. The default is December 31. Return Value A scalar value that represents the expression evaluated at the first date of the year in the current context. Remarks Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values. • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). Note The filter expression has restrictions described in the topic, CALCULATE Function (DAX). The year_end_date parameter is a string literal of a date, in the same locale as the locale of the client where the workbook was created. The year portion of the date is ignored. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example The following sample formula creates a measure that calculates the 'Year Start Inventory Value' of the product inventory. To see how this works, create a PivotTable and add the field, CalendarYear, to the Row Labels area of the PivotTable. Then add a measure, named Year Start Inventory Value, using the formula defined in the code section, to the Values area of the PivotTable. Code 63 =OPENINGBALANCEYEAR(SUMX(ProductInventory,ProductInventory[UnitCost]*Pr oductInventory[UnitsBalance]),DateTime[DateKey]) See Also OPENINGBALANCEQUARTER OPENINGBALANCEMONTH Time Intelligence Functions Closingbalanceyear Get Sample Data PARALLELPERIOD Function Returns a table that contains a column of dates that represents a period parallel to the dates in the specified dates column, in the current context, with the dates shifted a number of intervals either forward in time or back in time. Syntax PARALLELPERIOD(<dates>,<number_of_intervals>,<interval>) Parameters Term Definition dates A column that contains dates. number_of_intervals An integer that specifies the number of intervals to add to or subtract from the dates. interval The interval by which to shift the dates. The value for interval can be one of the following: year, quarter, month. Return Value A table containing a single column of date values. Remarks This function takes the current set of dates in the column specified by dates, shifts the first date and the last date the specified number of intervals, and then returns all contiguous dates between the two shifted dates. If the interval is a partial range of month, quarter, or year then any partial months in the result are also filled out to complete the entire interval. Note 64 To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column, • A table expression that returns a single column of date/time values, • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). If the number specified for number_of_intervals is positive, the dates in dates are moved forward in time; if the number is negative, the dates in dates are shifted back in time. The interval parameter is an enumeration, not a set of strings; therefore values should not be enclosed in quotation marks. Also, the values: year, quarter, month should be spelled in full when using them. The result table includes only dates that appear in the values of the underlying table column. The PARALLELPERIOD function is similar to the DATEADD function except that PARALLELPERIOD always returns full periods at the given granularity level instead of the partial periods that DATEADD returns. For example, if you have a selection of dates that starts at June 10 and finishes at June 21 of the same year, and you want to shift that selection forward by one month then the PARALLELPERIOD function will return all dates from the next month (July 1 to July 31); however, if DATEADD is used instead, then the result will include only dates from July 10 to July 21. If the dates in the current context do not form a contiguous interval, the function returns an error. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following sample formula creates a measure that calculates the previous year sales for Internet sales. To see how this works, create a PivotTable and add the fields, CalendarYear and CalendarQuarter, to the Row Labels area of the PivotTable. Then add a measure, named Previous Year Sales, using the formula defined in the code section, to the Values area of the PivotTable. Note 65 The above example uses the table DateTime from the DAX sample workbook. For more information about samples, see Get Sample Data . Code =CALCULATE(SUM(InternetSales_USD[SalesAmount_USD]), PARALLELPERIOD(DateTime[DateKey],-1,year)) See Also Time intelligence functions Date and time functions DATEADD Get Sample Data PREVIOUSDAY Function Returns a table that contains a column of all dates representing the day that is previous to the first date in the dates column, in the current context. Syntax PREVIOUSDAY(<dates>) Parameters Term Definition dates A column containing dates. Return Value A table containing a single column of date values. Remarks Note To understand more about how context affects the results of formulas, see Context. This function determines the first date in the input parameter, and then returns all dates corresponding to the day previous to that first date. For example, if the first date in the dates argument refers to June 10, 2009; this function returns all dates equal to June 9, 2009. The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values. 66 • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following sample formula creates a measure that calculates the 'previous day sales' for the Internet sales. To see how this works, create a PivotTable and add the fields, CalendarYear and MonthNumberOfYear, to the Row Labels area of the PivotTable. Then add a measure, named Previous Day Sales, using the formula defined in the code section, to the Values area of the PivotTable. Code =CALCULATE(SUM(InternetSales_USD[SalesAmount_USD]), PREVIOUSDAY('DateTime'[DateKey])) See Also Time intelligence functions Date and time functions PREVIOUSMONTH PREVIOUSQUARTER PREVIOUSYEAR PREVIOUSMONTH Function Returns a table that contains a column of all dates from the previous month, based on the first date in the dates column, in the current context. Syntax PREVIOUSMONTH(<dates>) Parameters Term Definition Dates A column containing dates. 67 Return Value A table containing a single column of date values. Remarks Note To understand more about how context affects the results of formulas, see Context. This function returns all dates from the previous month, using the first date in the column used as input. For example, if the first date in the dates argument refers to June 10, 2009, this function returns all dates for the month of May, 2009. The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values. • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following sample formula creates a measure that calculates the 'previous month sales' for the Internet sales. To see how this works, create a PivotTable and add the fields, CalendarYear and MonthNumberOfYear, to the Row Labels area of the PivotTable. Then add a measure, named Previous Month Sales, using the formula defined in the code section, to the Values area of the PivotTable. Code =CALCULATE(SUM(InternetSales_USD[SalesAmount_USD]), PREVIOUSMONTH('DateTime'[DateKey])) See Also Time intelligence functions Date and time functions PREVIOUSDAY PREVIOUSQUARTER PREVIOUSYEAR Get Sample Data 68 PREVIOUSQUARTER Function Returns a table that contains a column of all dates from the previous quarter, based on the first date in the dates column, in the current context. Syntax PREVIOUSQUARTER(<dates>) Parameters Term Definition dates A column containing dates. Return Value A table containing a single column of date values. Remarks Note To understand more about how context affects the results of formulas, see Context. This function returns all dates from the previous quarter, using the first date in the input column. For example, if the first date in the dates argument refers to June 10, 2009, this function returns all dates for the quarter January to March, 2009. The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values. • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following sample formula creates a measure that calculates the 'previous quarter sales' for Internet sales. To see how this works, create a PivotTable and add the fields, CalendarYear and CalendarQuarter, to the Row Labels area of the PivotTable. Then add a measure, named 69 Previous Quarter Sales, using the formula defined in the code section, to the Values area of the PivotTable. Code =CALCULATE(SUM(InternetSales_USD[SalesAmount_USD]), PREVIOUSQUARTER('DateTime'[DateKey])) See Also Time intelligence functions Date and time functions PREVIOUSMONTH PREVIOUSDAY PREVIOUSYEAR Get Sample Data PREVIOUSYEAR Function Returns a table that contains a column of all dates from the previous year, given the last date in the dates column, in the current context. Syntax PREVIOUSYEAR(<dates>[,<year_end_date>]) Parameters Term Definition dates A column containing dates. year_end_date (optional) A literal string with a date that defines the year-end date. The default is December 31. Return Value A table containing a single column of date values. Remarks Note To understand more about how context affects the results of formulas, see Context. This function returns all dates from the previous year given the latest date in the input parameter. For example, if the latest date in the dates argument refers to the year 2009, 70 then this function returns all dates for the year of 2008, up to the specified year_end_date. The dates argument can be any of the following: • A reference to a date/time column, • A table expression that returns a single column of date/time values, • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). The year_end_date parameter is a string literal of a date, in the same locale as the locale of the client where the workbook was created. The year portion of the date is ignored. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following sample formula creates a measure that calculates the previous year sales for the Internet sales. To see how this works, create a PivotTable and add the fields, CalendarYear and CalendarQuarter, to the Row Labels area of the PivotTable. Then add a measure, named Previous Year Sales, using the formula defined in the code section, to the Values area of the PivotTable. Code =CALCULATE(SUM(InternetSales_USD[SalesAmount_USD]), PREVIOUSYEAR('DateTime'[DateKey])) See Also Time intelligence functions Date and time functions PREVIOUSMONTH PREVIOUSDAY PREVIOUSQUARTER SAMEPERIODLASTYEAR Function Returns a table that contains a column of dates shifted one year back in time from the dates in the specified dates column, in the current context. Syntax 71 SAMEPERIODLASTYEAR(<dates>) Parameters Term Definition dates A column containing dates. Property Value/Return Value A single-column table of date values. Remarks Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column, • A table expression that returns a single column of date/time values, • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). The dates returned are the same as the dates returned by this equivalent formula: DATEADD(dates, -1, year) This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following sample formula creates a measure that calculates the previous year sales of the Reseller sales. To see how this works, create a PivotTable and add the fields, CalendarYear to the Row Labels area of the PivotTable. Then add a measure, named Previous Year Sales, using the formula defined in the code section, to the Values area of the PivotTable. Code =CALCULATE(SUM(ResellerSales_USD[SalesAmount_USD]), SAMEPERIODLASTYEAR(DateTime[DateKey])) See Also 72 Time intelligence functions Date and time functions PREVIOUSYEAR PARALLELPERIOD STARTOFMONTH Function Returns the first date of the month in the current context for the specified column of dates. Syntax STARTOFMONTH(<dates>) Parameters Term Definition dates A column that contains dates. Return Value A table containing a single column and single row with a date value. Remarks Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values. • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description 73 The following sample formula creates a measure that returns the start of the month, for the current context. To see how this works, create a PivotTable and add the fields CalendarYear and MonthNumberOfYear to the Row Labels area of the PivotTable. Then add a measure, named StartOfMonth, using the formula defined in the code section, to the Values area of the PivotTable. Code =STARTOFMONTH(DateTime[DateKey]) See Also Date and time functions time intelligence functions STARTOFYEAR STARTOFQUARTER STARTOFQUARTER Function Returns the first date of the quarter in the current context for the specified column of dates. Syntax STARTOFQUARTER(<dates>) Parameters Term Definition dates A column that contains dates. Return Value A table containing a single column and single row with a date value. Remarks Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values. • A Boolean expression that defines a single-column table of date/time values. 74 Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following sample formula creates a measure that returns the start of the quarter, for the current context. To see how this works, create a PivotTable and add the fields CalendarYear and MonthNumberOfYear to the Row Labels area of the PivotTable. Then add a measure, named StartOfQuarter, using the formula defined in the code section, to the Values area of the PivotTable. Code =STARTOFQUARTER(DateTime[DateKey]) See Also Date and time functions time intelligence functions STARTOFYEAR STARTOFMONTH STARTOFYEAR Function Returns the first date of the quarter in the current context for the specified column of dates. Syntax STARTOFQUARTER(<dates>) Parameters Term Definition dates A column that contains dates. Return Value A table containing a single column and single row with a date value. Remarks 75 Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values. • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following sample formula creates a measure that returns the start of the quarter, for the current context. To see how this works, create a PivotTable and add the fields CalendarYear and MonthNumberOfYear to the Row Labels area of the PivotTable. Then add a measure, named StartOfQuarter, using the formula defined in the code section, to the Values area of the PivotTable. Code =STARTOFQUARTER(DateTime[DateKey]) See Also Date and time functions time intelligence functions STARTOFYEAR STARTOFMONTH TOTALMTD Function Evaluates the value of the expression for the month to date, in the current context. Syntax TOTALMTD(<expression>,<dates>[,<filter>]) Parameters 76 Parameter Definition expression An expression that returns a scalar value. dates A column that contains dates. filter (optional) An expression that specifies a filter to apply to the current context. Return Value A scalar value that represents the expression evaluated for the dates in the current month-to-date, given the dates in dates. Remarks Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values. • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). Note The filter expression has restrictions described in the topic, CALCULATE Function (DAX). This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example The following sample formula creates a measure that calculates the 'month running total' or 'month running sum' for the Internet sales. To see how this works, create a PivotTable and add the fields, CalendarYear, MonthNumberOfYear and DayNumberOfMonth, to the Row Labels area of the PivotTable. Then add a measure, named Month-to-date Total, using the formula defined in the code section, to the Values area of the PivotTable. Code =TOTALMTD(SUM(InternetSales_USD[SalesAmount_USD]),DateTime[DateKey]) 77 See Also ALL CALCULATE TOTALYTD TOTALQTD Get Sample Data TOTALQTD Function Evaluates the value of the expression for the dates in the quarter to date, in the current context. Syntax TOTALQTD(<expression>,<dates>[,<filter>]) Parameters Parameter Definition expression An expression that returns a scalar value. dates A column that contains dates. filter (optional) An expression that specifies a filter to apply to the current context. Return Value A scalar value that represents the expression evaluated for all dates in the current quarter to date, given the dates in dates. Remarks Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column. • A table expression that returns a single column of date/time values. • A Boolean expression that defines a single-column table of date/time values. Note 78 Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). Note • The filter expression has restrictions described in the topic, CALCULATE Function (DAX). • This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example The following sample formula creates a measure that calculates the 'quarter running total' or 'quarter running sum' for the Internet sales. To see how this works, create a PivotTable and add the fields, CalendarYear, CalendarQuarter and MonthNumberOfYear, to the Row Labels area of the PivotTable. Then add a measure, named Quarter-to-date Total, using the formula defined in the code section, to the Values area of the PivotTable. Code =TOTALQTD(SUM(InternetSales_USD[SalesAmount_USD]),DateTime[DateKey]) See Also ALL CALCULATE TOTALYTD TOTALMTD Get Sample Data TOTALYTD Function Evaluates the year-to-date value of the expression in the current context. Syntax TOTALYTD(<expression>,<dates>[,<filter>][,<year_end_date>]) Parameters Parameter Definition expression An expression that returns a scalar value. dates A column that contains dates. filter (optional) An expression that specifies a 79 Parameter Definition filter to apply to the current context. year_end_date (optional) A literal string with a date that defines the year-end date. The default is December 31. Return Value A scalar value that represents the expression evaluated for the current year-to-date dates. Remarks Note To understand more about how context affects the results of formulas, see Context. The dates argument can be any of the following: • A reference to a date/time column, • A table expression that returns a single column of date/time values, • A Boolean expression that defines a single-column table of date/time values. Note Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX). Note The filter expression has restrictions described in the topic, CALCULATE Function (DAX). The year_end_date parameter is a string literal of a date, in the same locale as the locale of the client where the workbook was created. The year portion of the date is ignored. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example The following sample formula creates a measure that calculates the 'year running total' or 'year running sum' for the Internet sales. To see how this works, create a PivotTable and add the fields, CalendarYear, CalendarQuarter, and MonthNumberOfYear, to the Row Labels area of the PivotTable. Then add a measure, named Year-to-date Total, using the formula defined in the code section, to the Values area of the PivotTable. Code 80 =TOTALYTD(SUM(InternetSales_USD[SalesAmount_USD]),DateTime[DateKey]) See Also ALL CALCULATE DATESYTD Function (DAX) TOTALMTD TOTALQTD Get Sample Data DATE Function Returns the specified date in datetime format. Syntax DATE(<year>, <month>, <day>) Parameters Term Definition year A number representing the year. The value of the year argument can include one to four digits. The year argument is interpreted according to the date system used by your computer. Dates beginning with March 1, 1900 are supported. If you enter a number that has decimal places, the number is rounded. For values greater than 9999 or less than zero (negative values), the function returns a #VALUE! error. If the year value is between 0 and 1899, the value is added to 1900 to produce the final value. See the examples below. Note You should use four digits for the year argument whenever possible to prevent unwanted results. For 81 Term Definition example, using 07 returns 1907 as the year value. month A number representing the month or a calculation according to the following rules: If month is a number from 1 to 12, then it represents a month of the year. 1 represents January, 2 represents February, and so on until 12 that represents December. If you enter an integer larger than 12, the following computation occurs: the date is calculated by adding the value of month to the year. For example, if you have DATE( 2008, 18, 1), the function returns a datetime value equivalent to June 1st of 2009, because 18 months are added to the beginning of 2008 yielding a value of June 2009. See examples below. If you enter a negative integer, the following computation occurs: the date is calculated subtracting the value of month from year. For example, if you have DATE( 2008, -6, 15), the function returns a datetime value equivalent to June 15th of 2007, because when 6 months are subtracted from the beginning of 2008 it yields a value of June 2007. See examples below. day A number representing the day or a calculation according to the following rules: If day is a number from 1 to the last day of the given month then it represents a day of the month. If you enter an integer larger than last day of the given month, the following computation occurs: the date is calculated by adding the value of day to month. For example, in the formula DATE( 2008, 3, 32), the DATE function returns a datetime 82 Term Definition value equivalent to April 1st of 2008, because 32 days are added to the beginning of March yielding a value of April 1st. If you enter a negative integer, the following computation occurs: the date is calculated subtracting the value of day from month. For example, in the formula DATE( 2008, 5, -15), the DATE function returns a datetime value equivalent to April 15th of 2008, because 15 days are subtracted from the beginning of May 2008 yielding a value of April 2008. If day contains a decimal portion, it is rounded to the nearest integer value. Return Value Returns the specified date (datetime). Remarks The DATE function takes the integers that are input as arguments, and generates the corresponding date. The DATE function is most useful in situations where the year, month, and day are supplied by formulas. For example, the underlying data might contain dates in a format that is not recognized as a date, such as YYYYMMDD. You can use the DATE function in conjunction with other functions to convert the dates to a number that can be recognized as a date. In contrast to Microsoft Excel, which stores dates as a serial number, DAX date functions always return a datetime data type. However, you can use formatting to display dates as serial numbers if you want. This DAX function may return different results when used in a model that is deployed and then queried in DirectQuery mode. For more information about semantic differences in DirectQuery mode, see http://go.microsoft.com/fwlink/?LinkId=219171. Example: Returning a Simple Date Description The following formula returns the date July 8, 2009: Code =DATE(2009,7,8) Example: Years before 1899 83 Description If the value that you enter for the year argument is between 0 (zero) and 1899 (inclusive), that value is added to 1900 to calculate the year. The following formula returns January 2, 1908: (1900+08). Code =DATE(08,1,2) Example: Years before 1899 Description If the value that you enter for the year argument is between 0 (zero) and 1899 (inclusive), that value is added to 1900 to calculate the year. The following formula returns January 2, 3700: (1900+1800). Code =DATE(1800,1,2) Example: Years after 1899 Description If year is between 1900 and 9999 (inclusive), that value is used as the year. The following formula returns January 2, 2008: Code =DATE(2008,1,2) Example: Working with Months Description If month is greater than 12, month adds that number of months to the first month in the year specified. The following formula returns the date February 2, 2009: Code =DATE(2008,14,2) Comment If the month value is less than 1, the DATE function subtracts the magnitude of that number of months, plus 1, from the first month in the year specified. The following formula returns September 2, 2007: =DATE(2008,-3,2) Example: Working with Days Description If day is greater than the number of days in the month specified, day adds that number of days to the first day in the month. The following formula returns the date February 4, 2008: Code =DATE(2008,1,35) 84 Comment If day is less than 1, day subtracts the magnitude that number of days, plus one, from the first day of the month specified. The following formula returns December 16, 2007: =DATE(2008,1,-15) See Also Date and Time functions DAY TODAY DATEVALUE Function Converts a date in the form of text to a date in datetime format. Syntax DATEVALUE(date_text) Parameters Term Definition date_text Text that represents a date. Property Value/Return Value A date in datetime format. Remarks The DATEVALUE function uses the locale and date/time settings of the client computer to understand the text value when performing the conversion. If the current date/time settings represent dates in the format of Month/Day/Year, then the string, "1/8/2009", would be converted to a datetime value equivalent to January 8th of 2009. However, if the current date and time settings represent dates in the format of Day/Month/Year, the same string would be converted as a datetime value equivalent to August 1st of 2009. If the year portion of the date_text argument is omitted, the DATEVALUE function uses the current year from your computer's built-in clock. Time information in the date_text argument is ignored. Example Description The following example returns a different datetime value depending on your computer's locale and settings for how dates and times are presented. 85 • In date/time settings where the day precedes the month, the example returns a datetime value corresponding to January 8th of 2009. • In date/time settings where the month precedes the day, the example returns a datetime value corresponding to August 1st of 2009. Code =DATEVALUE("8/1/2009") See Also Date and Time functions DAY Function Returns the day of the month, a number from 1 to 31. Syntax DAY(<date>) Parameters Term Definition date A date in datetime format, or a text representation of a date. Return Value An integer number indicating the day of the month. Remarks The DAY function takes as an argument the date of the day you are trying to find. Dates can be provided to the function by using another date function, by using an expression that returns a date, or by typing a date in a datetime format. You can also type a date in one of the accepted string formats for dates. Values returned by the YEAR, MONTH and DAY functions will be Gregorian values regardless of the display format for the supplied date value. For example, if the display format of the supplied date is Hijri, the returned values for the YEAR, MONTH and DAY functions will be values associated with the equivalent Gregorian date. When the date argument is a text representation of the date, the day function uses the locale and date/time settings of the client computer to understand the text value in order to perform the conversion. If the current date/time settings represent dates in the format of Month/Day/Year, then the string, "1/8/2009", is interpreted as a datetime value equivalent to January 8th of 2009, and the function returns 8. However, if the current date/time settings represent dates in the format of Day/Month/Year, the same 86 string would be interpreted as a datetime value equivalent to August 1st of 2009, and the function returns 1. Example: Getting the Day from a Date Column Description The following formula returns the day from the date in the column, [Birthdate]. Code =DAY([Birthdate]) Example: Getting the Day from a String Date Description The following formulas return the day, 4, using dates that have been supplied as strings in an accepted text format. Code =DAY("3-4-1007") =DAY("March 4 2007") Example: Using a Day Value as a Condition Description The following expression returns the day that each sales order was placed, and flags the row as a promotional sale item if the order was placed on the 10th of the month. Code =IF( DAY([SalesDate])=10,"promotion","") See Also Date and Time functions TODAY DATE EDATE Function Returns the date that is the indicated number of months before or after the start date. Use EDATE to calculate maturity dates or due dates that fall on the same day of the month as the date of issue. Syntax EDATE(<start_date>, <months>) Parameters 87 Term Definition start_date A date in datetime or text format that represents the start date. months An integer that represents the number of months before or after start_date. Return Value A date (datetime). Remarks In contrast to Microsoft Excel, which stores dates as sequential serial numbers, DAX works with dates in a datetime format. Dates stored in other formats are converted implicitly. If start_date is not a valid date, EDATE returns an error. Make sure that the column reference or date that you supply as the first argument is a date. If months is not an integer, it is truncated. When the date argument is a text representation of the date, the EDATE function uses the locale and date time settings of the client computer to understand the text value in order to perform the conversion. If the current date time settings represent a date in the format of Month/Day/Year, then the following string "1/8/2009" is interpreted as a datetime value equivalent to January 8th of 2009. However, if the current date time settings represent a date in the format of Day/Month/Year, the same string would be interpreted as a datetime value equivalent to August 1st of 2009. If the requested date is past the last day of the corresponding month, then the last day of the month is returned. For example, the following functions: EDATE("2009-01-29", 1), EDATE("2009-01-30", 1), EDATE("2009-01-31", 1) return February 28th of 2009; that corresponds to one month after the start date. This DAX function may return different results when used in a model that is deployed and then queried in DirectQuery mode. For more information about semantic differences in DirectQuery mode, see http://go.microsoft.com/fwlink/?LinkId=219171. Example Description The following example returns the date three months after the order date, which is stored in the column [TransactionDate]. Code =EDATE([TransactionDate],3) See Also EOMONTH 88 Date and Time functions EOMONTH Function Returns the date in datetime format of the last day of the month, before or after a specified number of months. Use EOMONTH to calculate maturity dates or due dates that fall on the last day of the month. Syntax EOMONTH(<start_date>, <months>) Parameters Term Definition start_date The start date in datetime format, or in an accepted text representation of a date. months A number representing the number of months before or after the start_date. Note If you enter a number that is not an integer, the number is rounded up or down to the nearest integer. Return Value A date (datetime). Remarks In contrast to Microsoft Excel, which stores dates as sequential serial numbers, DAX works with dates in a datetime format. The EOMONTH function can accept dates in other formats, with the following restrictions: If start_date is not a valid date, EOMONTH returns an error. If start_date is a numeric value that is not in a datetime format, EOMONTH will convert the number to a date. To avoid unexpected results, convert the number to a datetime format before using the EOMONTH function. If start_date plus months yields an invalid date, EOMONTH returns an error. Dates before March 1st of 1900 and after December 31st of 9999 are invalid. When the date argument is a text representation of the date, the EDATE function uses the locale and date time settings, of the client computer, to understand the text value in order to perform the conversion. If current date time settings represent a date in the 89 format of Month/Day/Year, then the following string "1/8/2009" is interpreted as a datetime value equivalent to January 8th of 2009. However, if the current date time settings represent a date in the format of Day/Month/Year, the same string would be interpreted as a datetime value equivalent to August 1st of 2009. This DAX function may return different results when used in a model that is deployed and then queried in DirectQuery mode. For more information about semantic differences in DirectQuery mode, see http://go.microsoft.com/fwlink/?LinkId=219171. Example Description The following expression returns May 31, 2008, because the months argument is rounded to 2. Code =EOMONTH("March 3, 2008",1.5) See Also EDATE Date and Time functions HOUR Function Returns the hour as a number from 0 (12:00 A.M.) to 23 (11:00 P.M.). Syntax HOUR(<datetime>) Parameters Term Definition datetime A datetime value, such as 16:48:00 or 4:48 PM. Return Value An integer number from 0 to 23. Remarks The HOUR function takes as argument the time that contains the hour you want to find. You can supply the time by using a date/time function, an expression that returns a datetime, or by typing the value directly in one of the accepted time formats. Times can also be entered as any accepted text representation of a time. 90 When the datetime argument is a text representation of the date and time, the function uses the locale and date/time settings of the client computer to understand the text value in order to perform the conversion. Most locales use the colon (:) as the time separator and any input text using colons as time separators will parse correctly. Review your locale settings to understand your results. Example Description The following example returns the hour from the TransactionTime column of a table named Orders. Code =HOUR('Orders'[TransactionTime]) Example Description The following example returns 15, meaning the hour corresponding to 3 PM in a 24-hour clock. The text value is automatically parsed and converted to a date/time value. Code =HOUR("March 3, 2008 3:00 PM") See Also Date and Time functions MINUTE YEAR SECOND MINUTE Function Returns the minute as a number from 0 to 59, given a date and time value. Syntax MINUTE(<datetime>) Parameters Term Definition datetime A datetime value or text in an accepted time format, such as 16:48:00 or 4:48 PM. Return Value An integer number from 0 to 59. 91 Remarks In contrast to Microsoft Excel, which stores dates and times in a serial numeric format, DAX uses a datetime data type for dates and times. You can provide the datetime value to the MINUTE function by referencing a column that stores dates and times, by using a date/time function, or by using an expression that returns a date and time. When the datetime argument is a text representation of the date and time, the function uses the locale and date/time settings of the client computer to understand the text value in order to perform the conversion. Most locales use the colon (:) as the time separator and any input text using colons as time separators will parse correctly. Verify your locale settings to understand your results. Example Description The following example returns the minute from the value stored in the TransactionTime column of the Orders table. Code =MINUTE(Orders[TransactionTime]) Example Description The following example returns 45, which is the number of minutes in the time 1:45 PM. Code =MINUTE("March 23, 2008 1:45 PM") See Also Date and Time functions HOUR YEAR SECOND MONTH Function Returns the month as a number from 1 (January) to 12 (December). Syntax MONTH(<datetime>) Parameters Term Definition date A date in datetime or text format. 92 Return Value An integer number from 1 to 12. Remarks In contrast to Microsoft Excel, which stores dates as serial numbers, DAX uses a datetime format when working with dates. You can enter the date used as argument to the MONTH function by typing an accepted datetime format, by providing a reference to a column that contains dates, or by using an expression that returns a date. Values returned by the YEAR, MONTH and DAY functions will be Gregorian values regardless of the display format for the supplied date value. For example, if the display format of the supplied date is Hijri, the returned values for the YEAR, MONTH and DAY functions will be values associated with the equivalent Gregorian date. When the date argument is a text representation of the date, the function uses the locale and date time settings of the client computer to understand the text value in order to perform the conversion. If the current date time settings represent a date in the format of Month/Day/Year, then the following string "1/8/2009" is interpreted as a datetime value equivalent to January 8th of 2009, and the function yields a result of 1. However, if the current date time settings represent a date in the format of Day/Month/Year, then the same string would be interpreted as a datetime value equivalent to August 1st of 2009, and the function yields a result of 8. If the text representation of the date cannot be correctly converted to a datetime value, the function returns an error. Example Description The following expression returns 3, which is the integer corresponding to March, the month in the date argument. Code =MONTH("March 3, 2008 3:45 PM") Example Description The following expression returns the month from the date in the TransactionDate column of the Orders table. Code =MONTH(Orders[TransactionDate]) See Also Date and Time functions HOUR MINUTE 93 YEAR SECOND NOW Function Returns the current date and time in datetime format. The NOW function is useful when you need to display the current date and time on a worksheet or calculate a value based on the current date and time, and have that value updated each time you open the worksheet. Syntax NOW() Return Value A date (datetime). Remarks In contrast to Microsoft Excel, which stores dates and times as serial numbers, DAX uses a datetime format to work with dates. Dates that are not in this format are implicitly converted when you use dates and times in a formula. The result of the NOW function changes only when the column that contains the formula is refreshed. It is not updated continuously. The TODAY function returns the same date but is not precise with regard to time; the time returned is always 12:00:00 AM and only the date is updated. Example Description The following example returns the current date and time plus 3.5 days: Code =NOW()+3.5 See Also Date and Time functions TODAY SECOND Function Returns the seconds of a time value, as a number from 0 to 59. Syntax SECOND(<time>) Parameters 94 Term Definition time A time in datetime format, such as 16:48:23 or 4:48:47 PM. Return Value An integer number from 0 to 59. Remarks In contrast to Microsoft Excel, which stores dates and times as serial numbers, DAX uses a datetime format when working with dates and times. If the source data is not in this format, DAX implicitly converts the data. You can use formatting to display the dates and times as a serial number of you need to. The date/time value that you supply as an argument to the SECOND function can be entered as a text string within quotation marks (for example, "6:45 PM"). You can also provide a time value as the result of another expression, or as a reference to a column that contains times. If you provide a numeric value of another data type, such as 13.60, the value is interpreted as a serial number and is represented as a datetime data type before extracting the value for seconds. To make it easier to understand your results, you might want to represent such numbers as dates before using them in the SECOND function. For example, if you use SECOND with a column that contains a numeric value such as, 25.56, the formula returns 24. That is because, when formatted as a date, the value 25.56 is equivalent to January 25, 1900, 1:26:24 PM. When the time argument is a text representation of a date and time, the function uses the locale and date/time settings of the client computer to understand the text value in order to perform the conversion. Most locales use the colon (:) as the time separator and any input text using colons as time separators will parse correctly. Review your locale settings to understand your results. Example Description The following formula returns the number of seconds in the time contained in the TransactionTime column of a table named Orders. Code =SECOND('Orders'[TransactionTime]) Example Description The following formula returns 3, which is the number of seconds in the time represented by the value, March 3, 2008 12:00:03. 95 Code =SECOND("March 3, 2008 12:00:03") See Also Date and Time functions HOUR MINUTE YEAR TIME Function Converts hours, minutes, and seconds given as numbers to a time in datetime format. Syntax TIME(hour, minute, second) Parameters Term Definition hour A number from 0 to 23 representing the hour. Any value greater than 23 will be divided by 24 and the remainder will be treated as the hour value. minute A number from 0 to 59 representing the minute. Any value greater than 59 will be converted to hours and minutes. second A number from 0 to 59 representing the second. Any value greater than 59 will be converted to hours, minutes, and seconds. Return Value A time (datetime). Remarks In contrast to Microsoft Excel, which stores dates and times as serial numbers, DAX works with date and time values in a datetime format. Numbers in other formats are implicitly 96 converted when you use a date/time value in a DAX function. If you need to use serial numbers, you can use formatting to change the way that the numbers are displayed. Time values are a portion of a date value, and in the serial number system are represented by a decimal number. Therefore, the datetime value 12:00 PM is equivalent to 0.5, because it is half of a day. You can supply the arguments to the TIME function as values that you type directly, as the result of another expression, or by a reference to a column that contains a numeric value. The following restrictions apply: • Any value for hours that is greater than 23 will be divided by 24 and the remainder will be treated as the hour value. • Any value for minutes that is greater than 59 will be converted to hours and minutes. • Any value for seconds that is greater than 59 will be converted to hours, minutes, and seconds. • For minutes or seconds, a value greater than 24 hours will be divided by 24 and the reminder will be treated as the hour value. A value in excess of 24 hours does not alter the date portion. To improve readability of the time values returned by this function, we recommend that you format the column or PivotTable cell that contains the results of the formula by using one of the time formats provided by Microsoft Excel. This DAX function may return different results when used in a model that is deployed and then queried in DirectQuery mode. For more information about semantic differences in DirectQuery mode, see http://go.microsoft.com/fwlink/?LinkId=219171. Example Description The following examples both return the time, 3:00 AM: Code =TIME(27,0,0) =TIME(3,0,0) Example Description The following examples both return the time, 12:30 PM: Code =TIME(0,750,0) =TIME(12,30,0) Example Description The following example creates a time based on the values in the columns, intHours, intMinutes, intSeconds: 97 Code =TIME([intHours],[intMinutes],[intSeconds]) See Also DATE Date and Time functions TIMEVALUE Function Converts a time in text format to a time in datetime format. Syntax TIMEVALUE(time_text) Parameters Term Definition time_text A text string that that represents a certain time of the day. Any date information included in the time_text argument is ignored. Return Value A date (datetime). Remarks Time values are a portion of a date value and represented by a decimal number. For example, 12:00 PM is represented as 0.5 because it is half of a day. When the time_text argument is a text representation of the date and time, the function uses the locale and date/time settings of the client computer to understand the text value in order to perform the conversion. Most locales use the colon (:) as the time separator, and any input text using colons as time separators will parse correctly. Review your locale settings to understand your results. Example Description Code =TIMEVALUE("20:45:30") Comments See Also Date and Time functions 98 TODAY Function Returns the current date. Syntax TODAY() Return Value A date (datetime). Remarks The TODAY function is useful when you need to have the current date displayed on a worksheet, regardless of when you open the workbook. It is also useful for calculating intervals. Note If the TODAY function does not update the date when you expect it to, you might need to change the settings that control when the column or workbook is refreshed. For more information, see Data Refresh. The NOW function is similar but returns the exact time, whereas TODAY returns the time value 12:00:00 PM for all dates. Example Description If you know that someone was born in 1963, you might use the following formula to find that person's age as of this year's birthday: Code =YEAR(TODAY())-1963 Comments This formula uses the TODAY function as an argument for the YEAR function to obtain the current year, and then subtracts 1963, returning the person's age. See Also Date and Time functions NOW WEEKDAY Function Returns a number from 1 to 7 identifying the day of the week of a date. By default the day ranges from 1 (Sunday) to 7 (Saturday). Syntax WEEKDAY(<date>, <return_type>) 99 Parameters Term Definition date A date in datetime format. Dates should be entered by using the DATE function, by using expressions that result in a date, or as the result of other formulas. return_type A number that determines the return value: Return type Week begins 1 Week begins on Sunday (1) and ends on Saturday (7). 2 Week begins on Monday (1) and ends on Sunday (7). 3 Week begins on Monday (0) and ends on Sunday (6). Return Value An integer number from 1 to 7. Remarks In contrast to Microsoft Excel, which stores dates as serial numbers, DAX works with dates and times in a datetime format. If you need to display dates as serial numbers, you can use the formatting options in Excel. You can also type dates in an accepted text representation of a date, but to avoid unexpected results, it is best to convert the text date to a datetime format first. When the date argument is a text representation of the date, the function uses the locale and date/time settings of the client computer to understand the text value in order to perform the conversion. If the current date/time settings represent dates in the format of Month/Day/Year, then the string, "1/8/2009", is interpreted as a datetime value equivalent to January 8th of 2009. However, if the current date/time settings represent 100 dates in the format of Day/Month/Year, then the same string would be interpreted as a datetime value equivalent to August 1st of 2009. Example Description The following example gets the date from the [HireDate] column, adds 1, and displays the weekday corresponding to that date. Because the return_type argument has been omitted, the default format is used, in which 1 is Sunday and 7 is Saturday. If the result is 4, the day would be Wednesday. Code =WEEKDAY([HireDate]+1) See Also Date and Time functions WEEKNUM YEARFRAC WEEKNUM Function Returns the week number for the given date and year according to the return_type value. The week number indicates where the week falls numerically within a year. Syntax WEEKNUM(<date>, <return_type>) Parameters Term Definition date The date in datetime format. return_type A number that determines the return value: use 1 when the week begins on Sunday; use 2 when the week begins on Monday. The default is 1. Return type Week begins 1 Week begins on Sunday. Weekdays are numbered 1 through 7. 101 Term Definition 2 Week begins on Monday. Weekdays are numbered 1 through 7. Return Value An integer number. Remarks In contrast to Microsoft Excel, which stores dates as serial numbers, DAX uses a datetime data type to work with dates and times. If the source data is in a different format, DAX implicitly converts the data to datetime to perform calculations. By default, the WEEKNUM function uses a calendar convention in which the week containing January 1 is considered to be the first week of the year. However, the ISO 8601 calendar standard, widely used in Europe, defines the first week as the one with the majority of days (four or more) falling in the new year. This means that for years in which there are three days or less in the first week of January, the WEEKNUM function returns week numbers that are different from the ISO 8601 definition. Example Description The following example returns the week number of the date February 14, 2010. Code =WEEKNUM("Feb 14, 2010", 2) Example Description The following example returns the week number of the date stored in the column, HireDate, from the table, Employees. Code =WEEKNUM('Employees'[HireDate]) See Also Date and Time functions YEARFRAC WEEKDAY 102 YEAR Function Returns the year of a date as a four digit integer in the range 1900-9999. Syntax YEAR(<date>) Parameters Term Definition date A date in datetime or text format, containing the year you want to find. Return Value An integer in the range 1900-9999. Remarks In contrast to Microsoft Excel, which stores dates as serial numbers, DAX uses a datetime data type to work with dates and times. Dates should be entered by using the DATE function, or as results of other formulas or functions. You can also enter dates in accepted text representations of a date, such as March 3, 2007, or Mar-3-2003. Values returned by the YEAR, MONTH, and DAY functions will be Gregorian values regardless of the display format for the supplied date value. For example, if the display format of the supplied date uses the Hijri calendar, the returned values for the YEAR, MONTH, and DAY functions will be values associated with the equivalent Gregorian date. When the date argument is a text representation of the date, the function uses the locale and date time settings of the client computer to understand the text value in order to perform the conversion. Errors may arise if the format of strings is incompatible with the current locale settings. For example, if your locale defines dates to be formatted as month/day/year, and the date is provided as day/month/year, then 25/1/2009 will not be interpreted as January 25th of 2009 but as an invalid date. Example Description The following example returns 2007. Code =YEAR("March 2007") Example: Date as Result of Expression Description 103 The following example returns the year for today's date. Code =YEAR(TODAY()) See Also Date and Time functions HOUR MINUTE YEAR SECOND YEARFRAC Function Calculates the fraction of the year represented by the number of whole days between two dates. Use the YEARFRAC worksheet function to identify the proportion of a whole year's benefits or obligations to assign to a specific term. Syntax YEARFRAC(<start_date>, <end_date>, <basis>) Parameters Term Definition start_date The start date in datetime format. end_date The end date in datetime format. basis (Optional) The type of day count basis to use. All arguments are truncated to integers. Basis Description 0 US (NASD) 30/360 1 Actual/actual 2 Actual/360 3 Actual/365 4 European 30/360 104 Term Definition Return Value A decimal number. The internal data type is a signed IEEE 64-bit (8-byte) doubleprecision floating-point number. Remarks In contrast to Microsoft Excel, which stores dates as serial numbers, DAX uses a datetime format to work with dates and times. If you need to view dates as serial numbers, you can use the formatting options in Excel. If start_date or end_date are not valid dates, YEARFRAC returns an error. If basis < 0 or if basis > 4, YEARFRAC returns an error. Example Description The following example returns the fraction of a year represented by the difference between the dates in the two columns, TransactionDate and ShippingDate: Code =YEARFRAC(Orders[TransactionDate],Orders[ShippingDate]) Example Description The following example returns the fraction of a year represented by the difference between the dates, January 1 and March 1: Code =YEARFRAC("Jan 1 2007","Mar 1 2007") Comments Use four-digit years whenever possible, to avoid getting unexpected results. When the year is truncated, the current year is assumed. When the date is or omitted, the first date of the month is assumed. The second argument, basis, has also been omitted. Therefore, the year fraction is calculated according to the US (NASD) 30/360 standard. See Also Date and Time functions WEEKNUM YEARFRAC WEEKDAY 105 Filter Functions The filter and value functions in DAX are some of the most complex and powerful, and differ greatly from Excel functions. The lookup functions work by using tables and relationships, like a database. The filtering functions let you manipulate data context to create dynamic calculations. For a discussion of context, see Context in DAX Formulas. In this Section ALL Function ALLEXCEPT Function ALLNOBLANKROW Function ALLSELECTED Function CALCULATE Function CALCULATETABLE Function DISTINCT Function EARLIER Function EARLIEST Function FILTER Function FILTERS Function HASONEFILTER Function HASONEVALUE Function ISCROSSFILTERED Function ISFILTERED Function RELATED Function RELATEDTABLE Function VALUES Function Reference Using DAX Basic DAX Syntax Related Sections Date and Time Functions (DAX) Aggregation Functions (DAX) Logical Functions (DAX) Filter and Value Functions (DAX) Math and Trigonometric Functions (DAX) See Also 106 Getting Started with Data Analysis Expressions (DAX) ALL Function Returns all the rows in a table, or all the values in a column, ignoring any filters that might have been applied. This function is useful for clearing filters and creating calculations on all the rows in a table. Syntax ALL( {<table> | <column>[, <column>[, <column>[,…]]]} ) Parameters Term Definition table The table that you want to clear filters on. column The column that you want to clear filters on. The argument to the ALL function must be either a reference to a base table or a reference to a base column. You cannot use table expressions or column expressions with the ALL function. Return Value The table or column with filters removed. Remarks This function is not used by itself, but serves as an intermediate function that can be used to change the set of results over which some other calculation is performed. As described in the following table, you can use the ALL and ALLEXCEPT functions in different scenarios. Function and Usage Description ALL(Table) Removes all filters from the specified table. In effect, ALL(Table) returns all of the values in the table, removing any filters from the context that otherwise might have been applied. This function is useful when you are working with many levels of grouping, and want to create a calculation that creates a 107 Function and Usage Description ratio of an aggregated value to the total value. The first example demonstrates this scenario. ALL (Column[, Column[, …]]) Removes all filters from the specified columns in the table; all other filters on other columns in the table still apply. All column arguments must come from the same table. The ALL(Column) variant is useful when you want to remove the context filters for one or more specific columns and to keep all other context filters. The second and third examples demonstrate this scenario. ALLEXCEPT(Table, Column1 [,Column2]...) Removes all context filters in the table except filters that are applied to the specified columns. This is a convenient shortcut for situations in which you want to remove the filters on many, but not all, columns in a table. Example: Calculate Ratio of Category Sales to Total Sales Description Assume that you want to find the amount of sales for the current cell, in your PivotTable, divided by the total sales for all resellers. To ensure that the denominator is the same regardless of how the PivotTable user might be filtering or grouping the data, you define a formula that uses ALL to create the correct grand total. The following table shows the results when a new measure, All Reseller Sales Ratio, is created using the formula shown in the code section. To see how this works, add the field, CalendarYear, to the Row Labels area of the PivotTable, and add the field, ProductCategoryName, to the Column Labels area. Then, drag the measure, All Reseller Sales Ratio, to the Values area of the Pivot Table. To view the results as percentages, use the formatting features of Excel to apply a percentage number formatting to the cells that contains the measure. 108 All Reseller Column Labels Sales Row Labels Accessories Bikes Clothing Components Grand Total 2005 0.02% 9.10% 0.04% 0.75% 9.91% 2006 0.11% 24.71% 0.60% 4.48% 29.90% 2007 0.36% 31.71% 1.07% 6.79% 39.93% 2008 0.20% 16.95% 0.48% 2.63% 20.26% Grand Total 0.70% 82.47% 2.18% 14.65% 100.00% Code =SUMX(ResellerSales_USD, ResellerSales_USD[SalesAmount_USD])/SUMX(ALL(ResellerSales_USD), ResellerSales_USD[SalesAmount_USD]) Comments The formula is constructed as follows: 1. The numerator, SUMX(ResellerSales_USD, ResellerSales_USD[SalesAmount_USD]), is the sum of the values in ResellerSales_USD[SalesAmount_USD] for the current cell in the PivotTable, with context filters applied on CalendarYear and ProductCategoryName. 2. For the denominator, you start by specifying a table, ResellerSales_USD, and use the ALL function to remove all context filters on the table. 3. You then use the SUMX function to sum the values in the ResellerSales_USD[SalesAmount_USD] column. In other words, you get the sum of ResellerSales_USD[SalesAmount_USD] for all resellers sales. For more information about creating measures, see Create a Measure. Note The above example uses the tables, ResellerSales_USD, DateTime, and ProductCategory from the DAX sample workbook. For more information about samples, see Get Sample Data . Example: Calculate Ratio of Product Sales to Total Sales Through Current Year Description Assume that you want to create a table showing the percentage of sales compared over the years for each product category (ProductCategoryName). To obtain the percentage for each year over each value of ProductCategoryName, you need to divide the sum of 109 sales for that particular year and product category by the sum of sales for the same product category over all years. In other words, you want to keep the filter on ProductCategoryName but remove the filter on the year when calculating the denominator of the percentage. The following table shows the results when a new measure, Reseller Sales Year, is created using the formula shown in the code section. To see how this works, add the field, CalendarYear, to the Row Labels area of the PivotTable, and add the field, ProductCategoryName, to the Column Labels area. To view the results as percentages, use Excel's formatting features to apply a percentage number format to the cells containing the measure, Reseller Sales Year. Reseller Column Labels Sales Year Row Labels Accessories Bikes Clothing Components Grand Total 2005 3.48% 11.03% 1.91% 5.12% 9.91% 2006 16.21% 29.96% 27.29% 30.59% 29.90% 2007 51.62% 38.45% 48.86% 46.36% 39.93% 2008 28.69% 20.56% 21.95% 17.92% 20.26% Grand Total 100.00% 100.00% 100.00% 100.00% 100.00% Code =SUMX(ResellerSales_USD, ResellerSales_USD[SalesAmount_USD])/CALCULATE( SUM( ResellerSales_USD[SalesAmount_USD]), ALL(DateTime[CalendarYear])) Comments The formula is constructed as follows: 1. The numerator, SUMX(ResellerSales_USD, ResellerSales_USD[SalesAmount_USD]), is the sum of the values in ResellerSales_USD[SalesAmount_USD] for the current cell in the pivot table, with context filters applied on the columns CalendarYear and ProductCategoryName. 2. For the denominator, you remove the existing filter on CalendarYear by using the ALL(Column) function. This calculates the sum over the remaining rows on the ResellerSales_USD table, after applying the existing context filters from the column labels. The net effect is that for the denominator the sum is calculated over the selected ProductCategoryName (the implied context filter) and for all values in Year. For more information about creating measures, see Create a Measure. 110 Note This example uses the tables, ResellerSales_USD, DateTime, and ProductCategory from the DAX sample workbook. For more information about samples, see Get Sample Data . Example: Calculate Contribution of Product Categories to Total Sales Per Year Description Assume that you want to create a table that shows the percentage of sales for each product category, on a year-by-year basis. To obtain the percentage for each product category in a particular year, you need to calculate the sum of sales for that particular product category (ProductCategoryName) in year , and then divide the resulting value by the sum of sales for the year over all product categories. In other words, you want to keep the filter on year but remove the filter on ProductCategoryName when calculating the denominator of the percentage. The following table shows the results when a new measure, Reseller Sales CategoryName, is created using the formula shown in the code section. To see how this works, add the field, CalendarYear to the Row Labels area of the PivotTable, and add the field, ProductCategoryName, to the Column Labels area. Then add the new measure to the Values area of the PivotTable. To view the results as percentages, use Excel's formatting features to apply a percentage number format to the cells that contain the new measure, Reseller Sales CategoryName. Reseller Sales Column Labels CategoryName Row Labels Accessories Bikes Clothing Components Grand Total 2005 0.25% 91.76% 0.42% 7.57% 100.00% 2006 0.38% 82.64% 1.99% 14.99% 100.00% 2007 0.90% 79.42% 2.67% 17.01% 100.00% 2008 0.99% 83.69% 2.37% 12.96% 100.00% Grand Total 0.70% 82.47% 2.18% 14.65% 100.00% Code =SUMX(ResellerSales_USD, ResellerSales_USD[SalesAmount_USD])/CALCULATE( SUM( ResellerSales_USD[SalesAmount_USD]), ALL(ProductCategory[ProductCategoryName])) Comments 111 The formula is constructed as follows: 1. The numerator, SUMX(ResellerSales_USD, ResellerSales_USD[SalesAmount_USD]), is the sum of the values in ResellerSales_USD[SalesAmount_USD] for the current cell in the PivotTable, with context filters applied on the fields, CalendarYear and ProductCategoryName. 2. For the denominator, you use the function, ALL(Column), to remove the filter on ProductCategoryName and calculate the sum over the remaining rows on the ResellerSales_USD table, after applying the existing context filters from the row labels. The net effect is that, for the denominator, the sum is calculated over the selected Year (the implied context filter) and for all values of ProductCategoryName. For more information about creating measures, see Create a Measure. Note This example uses the tables, ResellerSales_USD, DateTime, and ProductCategory from the DAX sample workbook. For more information about samples, see Get Sample Data. See Also Filter and value functions ALL ALLEXCEPT FILTER ALLEXCEPT Function Removes all context filters in the table except filters that have been applied to the specified columns. Syntax ALLEXCEPT(<table>,<column>[,<column>[,…]]) Parameters Term Definition table The table over which all context filters are removed, except filters on those columns that are specified in subsequent arguments. column The column for which context filters must be preserved. 112 The first argument to the ALLEXCEPT function must be a reference to a base table; all subsequent arguments must be references to base columns. You cannot use table expressions or column expressions with the ALLEXCEPT function. Return Value A table with all filters removed except for the filters on the specified columns. Remarks This function is not used by itself, but serves as an intermediate function that can be used to change the set of results over which some other calculation is performed. As described in the following table, you can use the ALL and ALLEXCEPT functions in different scenarios. Function and Usage Description ALL(Table) Removes all filters from the specified table. In effect, ALL(Table) returns all of the values in the table, removing any filters from the context that otherwise might have been applied. This function is useful when you are working with many levels of grouping, and want to create a calculation that creates a ratio of an aggregated value to the total value. ALL (Column[, Column[, …]]) Removes all filters from the specified columns in the table; all other filters on other columns in the table still apply. All column arguments must come from the same table. The ALL(Column) variant is useful when you want to remove the context filters for one or more specific columns and to keep all other context filters. ALLEXCEPT(Table, Column1 [,Column2]...) Removes all context filters in the table except filters that are applied to the specified columns. This is a convenient shortcut for situations in which you want to remove the filters on many, but not all, columns in a table. 113 Example Description The following example presents a formula that you can use in a measure. For more information about how to create a measure, see Create a Measure. The formula sums SalesAmount_USD and uses the ALLEXCEPT function to remove any context filters on the DateTime table except if the filter has been applied to the CalendarYear column. Note The above example uses the tables, ResellerSales_USD and DateTime from the DAX sample workbook. For more information about samples, see Get Sample Data . Code =CALCULATE(SUM(ResellerSales_USD[SalesAmount_USD]), ALLEXCEPT(DateTime, DateTime[CalendarYear])) Comments Because the formula uses ALLEXCEPT, whenever any column but CalendarYear from the table DateTime is used to slice the PivotTable, the formula will remove any slicer filters, providing a value equal to the sum of SalesAmount_USD for the column label value, as shown in Table 1. However, if the column CalendarYear is used to slice the PivotTable, the results are different. Because CalendarYear is specified as the argument to ALLEXCEPT, when the data is sliced on the year, a filter will be applied on years at the row level, as shown in Table 2. The user is encouraged to compare these tables to understand the behavior of ALLEXCEPT(). See Also Filter and value functions ALL FILTER ALLNOBLANKROW Function From the parent table of a relationship, returns all rows but the blank row, or all distinct values of a column but the blank row, and disregards any context filters that might exist. Syntax ALLNOBLANKROW(<table>|<column>) Parameters 114 Term Definition table The table over which all context filters are removed. column The column over which all context filters are removed. Only one parameter must be passed; the parameter is either a table or a column. Return Value A table, when the passed parameter was a table, or a column of values, when the passed parameter was a column. Remarks The ALLNOBLANKROW function only filters the blank row that a parent table, in a relationship, will show when there are one or more rows in the child table that have nonmatching values to the parent column. See the example below for a thorough explanation. The following table summarizes the variations of ALL that are provided in DAX, and their differences: Function and Usage Description ALL(Column) Removes all filters from the specified column in the table; all other filters in the table, over other columns, still apply. ALL(Table) Removes all filters from the specified table. ALLEXCEPT(Table,Col1,Col2...) Overrides all context filters in the table except over the specified columns. ALLNOBLANK(table|column) From the parent table of a relationship, returns all rows but the blank row, or all distinct values of a column but the blank row, and disregards any context filters that might exist For a general description of how the ALL function works, together with step-by-step examples that use ALL(Table) and ALL(Column), see ALL Function (DAX). Example Description 115 In the sample data, the ResellerSales_USD table contains one row that has no values and therefore cannot be related to any of the parent tables in the relationships within the workbook. You will use this table in a PivotTable so that you can see the blank row behavior and how to handle counts on unrelated data. Step 1: Verify the unrelated data Open the PowerPivot window, then select the ResellerSales_USD table. In the ProductKey column, filter for blank values. One row will remain. In that row, all column values should be blank except for SalesOrderLineNumber. Step 2: Create a PivotTable Create a new PivotTable, then drag the column, datetime.[Calendar Year], to the Row Labels pane. The following table shows the expected results: Row Labels 2005 2006 2007 2008 Grand Total Note the blank label between 2008 and Grand Total. This blank label represents the Unknown member, which is a special group that is created to account for any values in the child table that have no matching value in the parent table, in this example the datetime.[Calendar Year] column. When you see this blank label in the PivotTable, you know that in some of the tables that are related to the column, datetime.[Calendar Year], there are either blank values or nonmatching values. The parent table is the one that shows the blank label, but the rows that do not match are in one or more of the child tables. The rows that get added to this blank label group are either values that do not match any value in the parent table-- for example, a date that does not exist in the datetime table-- or null values, meaning no value for date at all. In this example we have placed a blank value in all columns of the child sales table. Having more values in the parent table than in the children tables does not cause a problem. Step 3: Count rows using ALL and ALLNONBLANK Add the following two measures to the datetime table, to count the table rows: Countrows ALLNOBLANK of datetime, Countrows ALL of datetime. The formulas that you can use to define these measures are given in the code section following. 116 On a blank PivotTable add datetime.[Calendar Year] column to the row labels, and then add the newly created measures. The results should look like the following table: Row Labels Countrows ALLNOBLANK of Countrows ALL of datetime datetime 2005 1280 1281 2006 1280 1281 2007 1280 1281 2008 1280 1281 1280 1281 1280 1281 Grand Total The results show a difference of 1 row in the table rows count. However, if you open the PowerPivot window and select the datetime table, you cannot find any blank row in the table because the special blank row mentioned here is the Unknown member. Step 4: Verify that the count is accurate In order to prove that the ALLNOBLANKROW does not count any truly blank rows, and only handles the special blank row on the parent table only, add the following two measures to the ResellerSales_USD table: Countrows ALLNOBLANKROW of ResellerSales_USD, Countrows ALL of ResellerSales_USD. Create a new PivotTable, and drag the column, datetime.[Calendar Year], to the Row Labels pane. Now add the measures that you just created. The results should look like the following: Row Labels Countrows ALLNOBLANKROW of Countrows ALL of ResellerSales_USD ResellerSales_USD 2005 60856 60856 2006 60856 60856 2007 60856 60856 2008 60856 60856 60856 60856 60856 60856 Grand Total 117 Now the two measures have the same results. That is because the ALLNOBLANKROW function does not count truly blank rows in a table, but only handles the blank row that is a special case generated in a parent table, when one or more of the child tables in the relationship contain non-matching values or blank values. Code // Countrows ALLNOBLANK of datetime = COUNTROWS(ALLNOBLANKROW('DateTime')) // Countrows ALL of datetime = COUNTROWS(ALL('DateTime')) // Countrows ALLNOBLANKROW of ResellerSales_USD =COUNTROWS(ALLNOBLANKROW('ResellerSales_USD')) // Countrows ALL of ResellerSales_USD =COUNTROWS(ALL('ResellerSales_USD')) Comments See Also Filter and value functions ALL FILTER ALLSELECTED Function Removes context filters from columns and rows in the current query, while retaining all other context filters or explicit filters. The ALLSELECTED function gets the context that represents all rows and columns in the query, while keeping explicit filters and contexts other than row and column filters. This function can be used to obtain visual totals in queries. Syntax ALLSELECTED([<tableName> | <columnName>]) Parameters Parameter Description The name of an existing table, 118 using standard DAX syntax. This parameter cannot be an expression. This parameter is optional. The name of an existing column using standard DAX syntax, usually fully qualified. It cannot be an expression. This parameter is optional. Return Value The context of the query without any column and row filters. Exceptions Remarks • This function takes one or no arguments. If there is one argument, the argument is either tableName or columnName. • This function is different from ALL() because it retains all filters explicitly set within the query, and it retains all context filters other than row and column filters. Example Description The following example shows how to generate different levels of visual totals in a table report using DAX expressions. In the report two (2) previous filters have been applied to the Reseller Sales data; one on Sales Territory Group = Europe and the other on Promotion Type = Volume Discount. Once filters have been applied, visual totals can be calculated for the entire report, for All Years, or for All Product Categories. Also, for illustration purposes the grand total for All Reseller Sales is obtained too, removing all filters in the report. Evaluating the following DAX expression results in a table with all the information needed to build a table with Visual Totals. Code define measure 'Reseller Sales'[Reseller Sales Amount]=sum('Reseller Sales'[Sales Amount]) measure 'Reseller Sales'[Reseller Grand Total]=calculate(sum('Reseller Sales'[Sales Amount]), ALL('Reseller Sales')) measure 'Reseller Sales'[Reseller Visual Total]=calculate(sum('Reseller Sales'[Sales Amount]), ALLSELECTED()) 119 measure 'Reseller Sales'[Reseller Visual Total for All of Calendar Year]=calculate(sum('Reseller Sales'[Sales Amount]), ALLSELECTED('Date'[Calendar Year])) measure 'Reseller Sales'[Reseller Visual Total for All of Product Category Name]=calculate(sum('Reseller Sales'[Sales Amount]), ALLSELECTED('Product Category'[Product Category Name])) evaluate CalculateTable( //CT table expression summarize( //summarize table expression crossjoin(distinct('Product Category'[Product Category Name]), distinct('Date'[Calendar Year])) //First Group by expression , 'Product Category'[Product Category Name] //Second Group by expression , 'Date'[Calendar Year] //Summary expressions , "Reseller Sales Amount", [Reseller Sales Amount] , "Reseller Grand Total", [Reseller Grand Total] , "Reseller Visual Total", [Reseller Visual Total] , "Reseller Visual Total for All of Calendar Year", [Reseller Visual Total for All of Calendar Year] , "Reseller Visual Total for All of Product Category Name", [Reseller Visual Total for All of Product Category Name] ) //CT filters , 'Sales Territory'[Sales Territory Group]="Europe", 'Promotion'[Promotion Type]="Volume Discount" ) order by [Product Category Name], [Calendar Year] 120 Comments After executing the above expression in SQL Server Management Studio against AdventureWorks DW Tabular Model 2012 you obtain the following results: [Product Category Name] [Calend ar Year] [Reseller [Reseller Grand [Reseller [Reseller [Reseller Sales Amount] Total] Visual Total] Visual Total Visual Total for All of for All of Calendar Product Year] Category Name] Accessories 2000 80450596.98 23 877006.79 87 38786.018 Accessories 2001 80450596.98 23 877006.79 87 38786.018 Accessories 2002 625.7933 80450596.98 23 877006.79 87 38786.018 91495.310 4 Accessories 2003 26037.313 2 80450596.98 23 877006.79 87 38786.018 572927.01 36 Accessories 2004 12122.911 5 80450596.98 23 877006.79 87 38786.018 212584.47 47 Accessories 2005 80450596.98 23 877006.79 87 38786.018 Accessories 2006 80450596.98 23 877006.79 87 38786.018 Bikes 2000 80450596.98 23 877006.79 87 689287.79 39 Bikes 2001 80450596.98 23 877006.79 87 689287.79 39 Bikes 2002 73778.938 80450596.98 23 877006.79 87 689287.79 39 91495.310 4 Bikes 2003 439771.41 36 80450596.98 23 877006.79 87 689287.79 39 572927.01 36 Bikes 2004 175737.44 23 80450596.98 23 877006.79 87 689287.79 39 212584.47 47 Bikes 2005 80450596.98 877006.79 689287.79 121 [Product [Reseller [Reseller Grand [Reseller [Reseller [Reseller Total] Visual Total] Visual Total Visual Total for All of for All of Calendar Product Year] Category Category [Calend Sales Name] ar Year] Amount] Name] 23 87 39 Bikes 2006 80450596.98 23 877006.79 87 689287.79 39 Clothing 2000 80450596.98 23 877006.79 87 95090.775 7 Clothing 2001 80450596.98 23 877006.79 87 95090.775 7 Clothing 2002 12132.433 4 80450596.98 23 877006.79 87 95090.775 7 91495.310 4 Clothing 2003 58234.221 4 80450596.98 23 877006.79 87 95090.775 7 572927.01 36 Clothing 2004 24724.120 9 80450596.98 23 877006.79 87 95090.775 7 212584.47 47 Clothing 2005 80450596.98 23 877006.79 87 95090.775 7 Clothing 2006 80450596.98 23 877006.79 87 95090.775 7 Componen 2000 ts 80450596.98 23 877006.79 87 53842.211 1 Componen 2001 ts 80450596.98 23 877006.79 87 53842.211 1 Componen 2002 ts 4958.1457 80450596.98 23 877006.79 87 53842.211 1 91495.310 4 Componen 2003 ts 48884.065 4 80450596.98 23 877006.79 87 53842.211 1 572927.01 36 Componen 2004 ts 80450596.98 23 877006.79 87 53842.211 1 212584.47 47 Componen 2005 ts 80450596.98 23 877006.79 87 53842.211 1 122 [Product [Reseller [Reseller Grand [Reseller [Reseller [Reseller Total] Visual Total] Visual Total Visual Total for All of for All of Calendar Product Year] Category Category [Calend Sales Name] ar Year] Amount] Name] Componen 2006 ts 80450596.98 23 877006.79 87 53842.211 1 The columns in the report are: Reseller Sales Amount The actual value of Reseller Sales for the year and product category. This value appears in a cell in the center of your report, at the intersection of year and catergory. Reseller Visual Total for All of Calendar Year The total value for a product category across all years. This value appears at the end of a column or row for a given product category and across all years in the report. Reseller Visual Total for All of Product Category Name The total value for a year across all product categories. This value appears at the end of a column or row for a given year and across all product categories in the report. Reseller Visual Total The total value for all years and product categories. This value usually appears in the bottom rightmost corner of the table. Reseller Grand Total This is the grand total for all reseller sales, before any filter has been applied; you should notice the difference with [Reseller Visual Total]. You do remember that this report includes two (2) filters, one on Product Category Group and the other in Promotion Type. Example Description The following example shows the usage of ALLSELECTED() with no arguments to show how to calculate a ratio over the total value shown in a table that has been filtered by using horizontal and vertical slicers. This example uses SQL Server 2012, PowerPivot for Excel and PowerPivot Sample Data (DAX_AdventureWorks). • In the PowerPivot field list, drag the column, ResellerSales[SalesAmount_USD], to the Values area. • Drag Promotion[PromotionType] to the Slicers Vertical area. Select the slicers for Discontinued Product, Excess Inventory and Seasonal Discount. 123 • Drag SalesTerritory[SalesTerritoryGroup] to the Slicers Horizontal area. Select the slicer for Europe. • The value of Sum Of SalesAmount_USD should be $19,614.37 • Drag ProductCategory[ProductCategoryName] to the Row Labels area and DateTime[CalendarYear] to the Column Labels area. Your table should look similar to: SalesTerritory Group Europe North America Pacific NA Promotion Type Discontinue d Product Sum of Colum SalesAmount n _USD Labels Excess Inventory Row Labels 2006 2007 New Product Accessories $1,111. 22 $3,414. 43 No Discount Bikes $8,834. 94 Seasonal Discount Grand Total $9,946 .16 $3,414 .43 2008 Grand Total $4,525. 66 $6,253. 78 $15,088 .72 $6,253 .78 $19,614 .37 Volume Discount • Using a hand calculator, verify that the amount $3,414.43 (for Accessories in 2007) represents 17.41% of $19,614.37. • Using a hand calculator, verify that the amount $6,253.78 (for Bikes in 2008) represents 31.88% of $19,614.37. • Using a hand calculator, verify that the amount $15,088.72 (for Bikes Grand Total) represents 76.93% of $19,614.37. 124 • Remove ResellerSales[SalesAmount_USD] from the Values area. • Create a measure, named Reseller Sales Ratio, in the ResellerSales table, using the following formula (format the result as percentage): Code =SUM(ResellerSales_USD[SalesAmount_USD])/ CALCULATE(SUM(ResellerSales_USD[SalesAmount_USD]), ALLSELECTED()) Comments Your table should look like this: SalesTerritoryGroup Europe North America Pacific NA PromotionType Discontinued Product Reseller Column Sales Ratio Labels Excess Inventory Row Labels New Product Accessories 5.67 % No Discount Bikes 45.04 % Seasonal Discount Grand Total 50.71 % 17.41 31.88 100.00 % % % 2006 2007 2008 Grand Total 23.07 % 17.41 % 31.88 % 76.93 % Volume Discount • Compare your handheld calculator results with those given by Reseller Sales Ratio and they should match; your denominator value is fixed as the value at the bottom of the table. • Because the CALCULATE formula in the denominator uses the ALLSELECTED function, the denominator represents the grand total of sales, at the bottom of the table, after the vertical, horizontal and page slicers have been applied; but, before the row and column slicers are applied . 125 Note: if you have explicit filters in your expression, those filters are also applied to the expression. CALCULATE Function Evaluates an expression in a context that is modified by the specified filters. Syntax CALCULATE(<expression>,<filter1>,<filter2>…) Parameters Term Definition expression The expression to be evaluated. filter1,filter2,… (optional) A comma separated list of Boolean expression or a table expression that defines a filter. The expression used as the first parameter is essentially the same as a measure. The following restrictions apply to Boolean expressions that are used as arguments: • The expression cannot reference a measure. • The expression cannot use a nested CALCULATE function. • The expression cannot use any function that scans a table or returns a table, including aggregation functions. However, a Boolean expression can use any function that looks up a single value, or that calculate a scalar value. Return Value The value that is the result of the expression. Remarks If the data has been filtered, the CALCULATE function changes the context in which the data is filtered, and evaluates the expression in the new context that you specify. For each column used in a filter argument, any existing filters on that column are removed, and the filter used in the filter argument is applied instead. Example Description To calculate the ratio of current reseller sales to all reseller sales, you add to the PivotTable a measure that calculates the sum of sales for the current cell (the numerator), and then divides that sum by the total sales for all resellers (the denominator). To ensure 126 that the denominator remains the same regardless of how the PivotTable might be filtering or grouping the data, the part of the formula that represents the denominator must use the ALL function to clear any filters and create the correct total. The following table shows the results when the new measure, named All Reseller Sales Ratio, is created by using the formula in the code section. To see how this works, add the field, CalendarYear, to the Row Labels area of the PivotTable, and add the field, ProductCategoryName, to the Column Labels area. Then add the new measure to the Values area of the PivotTable. To display the numbers as percentages, apply percentage number formatting to the area of the PivotTable that contains the new measure, All Reseller Sales Ratio. All Reseller Column Labels Sales Row Labels Accessories Bikes Clothing Components Grand Total 2005 0.02% 9.10% 0.04% 0.75% 9.91% 2006 0.11% 24.71% 0.60% 4.48% 29.90% 2007 0.36% 31.71% 1.07% 6.79% 39.93% 2008 0.20% 16.95% 0.48% 2.63% 20.26% Grand Total 0.70% 82.47% 2.18% 14.65% 100.00% Code =( SUM('ResellerSales_USD'[SalesAmount_USD])) /CALCULATE( SUM('ResellerSales_USD'[SalesAmount_USD]) ,ALL('ResellerSales_USD')) Comments The CALCULATE expression in the denominator enables the sum expression to include all rows in the calculation. This overrides the implicit filters for CalendarYear and ProductCategoryName that exist for the numerator part of the expression. Related Functions Whereas the CALCULATE function requires as its first argument an expression that returns a single value, the CALCULATETABLE function takes a table of values. See Also CALCULATETABLE Function Filter and value functions 127 CALCULATETABLE Function Evaluates a table expression in a context modified by the given filters. Syntax CALCULATETABLE(<expression>,<filter1>,<filter2>,…) Parameters Term Definition Expression The table expression to be evaluated filter1,filter2,… A Boolean expression or a table expression that defines a filter The expression used as the first parameter must be a function that returns a table. The following restrictions apply to Boolean expressions that are used as arguments: • The expression cannot reference a measure. • The expression cannot use a nested CALCULATE function. • The expression cannot use any function that scans a table or returns a table, including aggregation functions. However, a Boolean expression can use any function that looks up a single value, or that calculates a scalar value. Return Value A table of values. Remarks The CALCULATETABLE function changes the context in which the data is filtered, and evaluates the expression in the new context that you specify. For each column used in a filter argument, any existing filters on that column are removed, and the filter used in the filter argument is applied instead. This function is a synonym for the RELATEDTABLE function. Example Description The following example uses the CALCULATETABLE function to get the sum of Internet sales for 2006. This value is later used to calculate the ratio of Internet sales compared to all sales for the year 2006. The following table shows the results from the following formula. 128 Row Labels Internet SalesAmount_USD CalculateTable 2006 Internet Sales to Internet Sales 2006 ratio 2005 $2,627,031.40 $5,681,440.58 0.46 2006 $5,681,440.58 $5,681,440.58 1.00 2007 $8,705,066.67 $5,681,440.58 1.53 2008 $9,041,288.80 $5,681,440.58 1.59 Grand Total $26,054,827.45 $5,681,440.58 4.59 Code =SUMX( CALCULATETABLE('InternetSales_USD', 'DateTime'[CalendarYear]=2006) , [SalesAmount_USD]) See Also RELATEDTABLE Function (DAX) Filter and value functions DISTINCT Function Returns a one-column table that contains the distinct values from the specified column. In other words, duplicate values are removed and only unique values are returned. Note This function cannot be used to return values into a cell or column on a worksheet; rather, you nest the DISTINCT function within a formula, to get a list of distinct values that can be passed to another function and then counted, summed, or used for other operations. Syntax DISTINCT(<column>) Parameters Term Definition column The column from which unique values are to be returned. Or, an expression that returns a column. 129 Return Value A column of unique values. Remarks The results of DISTINCT are affected by the current filter context. For example, if you use the formula in the following example to create a measure, the results would change whenever the table was filtered to show only a particular region or a time period. Related Functions The VALUES function is similar to DISTINCT; it can also be used to return a list of unique values, and generally will return exactly the same results as DISTINCT. However, in some context VALUES will return one additional special value. For more information, see VALUES Function (DAX). Example Description The following formula counts the number of unique customers who have generated orders over the internet channel. The table that follows illustrates the possible results when the formula is added to a PivotTable. Code =COUNTROWS(DISTINCT(InternetSales_USD[CustomerKey])) Comments Note that you cannot paste the list of values that DISTINCT returns directly into a column. Instead, you pass the results of the DISTINCT function to another function that counts, filters, or aggregates values by using the list. To make the example as simple as possible, here the table of distinct values has been passed to the COUNTROWS function. Unique Internet Column Labels customers Row Labels Accessories Bikes Clothing Grand Total 2005 1013 1013 2006 2677 2677 2007 6792 4875 2867 9309 2008 9435 5451 4196 11377 Grand Total 15114 9132 6852 18484 Also, note that the results are not additive. That is to say, the total number of unique customers in 2007 is not the sum of unique customers of Accessories, Bikes and Clothing for that year. The reason is that a customer can be counted in multiple groups. 130 See Also Filter and value functions FILTER RELATED VALUES EARLIER Function Returns the current value of the specified column in an outer evaluation pass of the mentioned column. EARLIER is useful for nested calculations where you want to use a certain value as an input and produce calculations based on that input. In Microsoft Excel, you can do such calculations only within the context of the current row; however, in DAX you can store the value of the input and then make calculation using data from the entire table. EARLIER is mostly used in the context of calculated columns. Syntax EARLIER(<column>, <number>) Parameters Term Definition column A column or expression that resolves to a column. num (Optional) A positive number to the outer evaluation pass. The next evaluation level out is represented by 1; two levels out is represented by 2 and so on. When omitted default value is 1. Property Value/Return Value The current value of row, from column, at number of outer evaluation passes. Exceptions Description of errors Remarks EARLIER succeeds if there is a row context prior to the beginning of the table scan. Otherwise it returns an error. 131 The performance of EARLIER might be slow because it theoretically, it might have to perform a number of operations that is close to the total number of rows (in the column) times the same number (depending on the syntax of the expression). For example if you have 10 rows in the column, approximately a 100 operations could be required; if you have 100 rows then close to 10,000 operations might be performed. Note In practice, the xVelocity in-memory analytics engine (VertiPaq) performs optimizations to reduce the actual number of calculations, but you should be cautious when creating formulas that involve recursion. Example Description To illustrate the use of EARLIER, it is necessary to build a scenario that calculates a rank value and then uses that rank value in other calculations. The following example is based on this simple table, ProductSubcategory, which shows the total sales for each ProductSubcategory. The final table, including the ranking column is shown here. ProductSubcategoryK EnglishProductSubcategoryNa TotalSubcategorySal SubcategoryRankin ey me es g 18 Bib-Shorts $156,167.88 18 26 Bike Racks $220,720.70 14 27 Bike Stands $35,628.69 30 28 Bottles and Cages $59,342.43 24 5 Bottom Brackets $48,643.47 27 6 Brakes $62,113.16 23 19 Caps $47,934.54 28 7 Chains $8,847.08 35 29 Cleaners $16,882.62 32 8 Cranksets $191,522.09 15 9 Derailleurs $64,965.33 22 30 Fenders $41,974.10 29 10 Forks $74,727.66 21 20 Gloves $228,353.58 12 132 ProductSubcategoryK EnglishProductSubcategoryNa TotalSubcategorySal SubcategoryRankin ey me es g 4 Handlebars $163,257.06 17 11 Headsets $57,659.99 25 31 Helmets $451,192.31 9 32 Hydration Packs $96,893.78 20 21 Jerseys $699,429.78 7 33 Lights 34 Locks $15,059.47 33 1 Mountain Bikes $34,305,864.29 2 12 Mountain Frames $4,511,170.68 4 35 Panniers 13 Pedals $140,422.20 19 36 Pumps $12,695.18 34 2 Road Bikes $40,551,696.34 1 14 Road Frames $3,636,398.71 5 15 Saddles $52,526.47 26 22 Shorts $385,707.80 10 23 Socks $28,337.85 31 24 Tights $189,179.37 16 37 Tires and Tubes $224,832.81 13 3 Touring Bikes $13,334,864.18 3 16 Touring Frames $1,545,344.02 6 25 Vests $240,990.04 11 17 Wheels $648,240.04 8 36 36 Creating a Rank Value One way to obtain a rank value for a given value in a row is to count the number of rows, in the same table, that have a value larger (or smaller) than the one that is being compared. This technique returns a blank or zero value for the highest value in the table, 133 whereas equal values will have the same rank value and next value (after the equal values) will have a non consecutive rank value. See the sample below. A new calculated column, SubCategorySalesRanking, is created by using the following formula. Code = COUNTROWS(FILTER(ProductSubcategory, EARLIER(ProductSubcategory[TotalSubcategorySales])<ProductSubcategory[T otalSubcategorySales]))+1 Comments The following steps describe the method of calculation in more detail. 1. The EARLIER function gets the value of TotalSubcategorySales for the current row in the table. In this case, because the process is starting, it is the first row in the table 2. EARLIER([TotalSubcategorySales]) evaluates to $156,167.88, the current row in the outer loop. 3. The FILTER function now returns a table where all rows have a value of TotalSubcategorySales larger than $156,167.88 (which is the current value for EARLIER). 4. The COUNTROWS function counts the rows of the filtered table and assigns that value to the new calculated column in the current row plus 1. Adding 1 is needed to prevent the top ranked value from become a Blank. 5. The calculated column formula moves to the next row and repeats steps 1 to 4. These steps are repeated until the end of the table is reached. The EARLIER function will always get the value of the column prior to the current table operation. If you need to get a value from the loop before that, set the second argument to 2. See Also EARLIESTfunction Filter and value functions EARLIEST Function Returns the current value of the specified column in an outer evaluation pass of the specified column. Syntax EARLIEST(<column>) Parameters 134 Term Definition column A reference to a column. Property Value/Return Value A column with filters removed. Remarks The EARLIEST function is similar to EARLIER, but lets you specify one additional level of recursion. Example Description The current sample data does not support this scenario. Code =EARLIEST(<column>) See Also EARLIER function Filter and value functions FILTER Function Returns a table that represents a subset of another table or expression. Syntax FILTER(<table>,<filter>) Parameters Term Definition table The table to be filtered. The table can also be an expression that results in a table. filter A Boolean expression that is to be evaluated for each row of the table. For example, [Amount] > 0 or [Region] = "France" Return Value A table containing only the filtered rows. 135 Remarks You can use FILTER to reduce the number of rows in the table that you are working with, and use only specific data in calculations. FILTER is not used independently, but as a function that is embedded in other functions that require a table as an argument. Example Description The following example creates a report of Internet sales outside the United States by using a measure that filters out sales in the United States, and then slicing by calendar year and product categories. To create this measure, you filter the table, Internet Sales USD, by using Sales Territory, and then use the filtered table in a SUMX function. In this example, the expression FILTER('InternetSales_USD', RELATED('SalesTerritory'[SalesTerritoryCountry])<>"United States") returns a table that is a subset of Internet Sales minus all rows that belong to the United States sales territory. The RELATED function is what links the Territory key in the Internet Sales table to SalesTerritoryCountry in the SalesTerritory table. The following table demonstrates the proof of concept for the measure, NON USA Internet Sales, the formula for which is provided in the code section below. The table compares all Internet sales with non- USA Internet sales, to show that the filter expression works, by excluding United States sales from the computation. To re-create this table, add the field, SalesTerritoryCountry, to the Row Labels area of the PivotTable. Table 1. Comparing total sales for U.S. vs. all other regions Row Labels Internet Sales Non USA Internet Sales Australia $4,999,021.84 $4,999,021.84 Canada $1,343,109.10 $1,343,109.10 France $2,490,944.57 $2,490,944.57 Germany $2,775,195.60 $2,775,195.60 United Kingdom $5,057,076.55 $5,057,076.55 United States $9,389,479.79 Grand Total $26,054,827.45 $16,665,347.67 The final report table shows the results when you create a PivotTable by using the measure, NON USA Internet Sales. Add the field, CalendarYear, to the Row Labels area of the PivotTable and add the field, ProductCategoryName, to the Column Labels area. Table 2. Comparing non- U.S. sales by product categories 136 Non USA Column Labels Internet Sales Row Labels Accessories Bikes Clothing Grand Total 2005 $1,526,481.95 $1,526,481.95 2006 $3,554,744.04 $3,554,744.04 2007 $156,480.18 $5,640,106.05 $70,142.77 $5,866,729.00 2008 $228,159.45 $5,386,558.19 $102,675.04 $5,717,392.68 $16,107,890.23 $172,817.81 $16,665,347.67 Grand Total $384,639.63 Code SUMX(FILTER('InternetSales_USD', RELATED('SalesTerritory'[SalesTerritoryCountry])<>"United States") ,'InternetSales_USD'[SalesAmount_USD]) See Also Filter and value functions ALL ALLEXCEPT FILTERS Function Returns the values that are directly applied as filters to columnName. Syntax FILTERS(<columnName>) Parameters Parameter Description The name of an existing column, using standard DAX syntax. It cannot be an expression. Return Value The values that are directly applied as filters to columnName. Remarks 137 Example Description The following example shows how to determine the number of direct filters a column has. Code =COUNTROWS(FILTERS(ResellerSales_USD[ProductKey])) Comments The example above lets you know how many direct filters on ResellerSales_USD[ProductKey] have been applied to the context where the expression is being evaluated. HASONEFILTER Function Returns TRUE when the number of directly filtered values on columnName is one; otherwise returns FALSE. Syntax HASONEFILTER(<columnName>) Parameters Parameter Description The name of an existing column, using standard DAX syntax. It cannot be an expression. Return Value TRUE when the number of directly filtered values on columnName is one; otherwise returns FALSE. Remarks 1. An equivalent expression for HASONEFILTER() is COUNTROWS(FILTERS(<columnName>)) = 1. 2. This function is similar to HASONEVALUE() with the difference that HASONEVALUE() works based on cross-filters while HASONEFILTER() works by a direct filter. Example Description The following example shows how to use HASONEFILTER() to return the filter for ResellerSales_USD[ProductKey]) if there is one filter, or to return BLANK if there are no filters or more than one filter on ResellerSales_USD[ProductKey]). 138 Code =IF(HASONEFILTER(ResellerSales_USD[ProductKey]),FILTERS(ResellerSales_U SD[ProductKey]),BLANK()) Comments HASONEVALUE Function Returns TRUE when the context for columnName has been filtered down to one distinct value only. Otherwise is FALSE. Syntax HASONEVALUE(<columnName>) Parameters Parameter Description The name of an existing column, using standard DAX syntax. It cannot be an expression. Return Value TRUE when the context for columnName has been filtered down to one distinct value only. Otherwise is FALSE. Remarks • An equivalent expression for HASONEVALUE() is COUNTROWS(VALUES(<columnName>)) = 1. Example Description In the following example you want to create a formula that verifies if the context is being sliced by one value in order to estimate a percentage against a predefined scenario; in this case you want to compare Reseller Sales against sales in 2007, then you need to know if the context is filtered by single years. Also, if the comparison is meaningless you want to return BLANK. If you want to follow the scenario, you can download the spreadsheet with the model from PowerPivot Sample Data spreadsheet. Create a measure named [ResellerSales compared to 2007] using the following expression: Code 139 =IF(HASONEVALUE(DateTime[CalendarYear]),SUM(ResellerSales_USD[SalesAmou nt_USD])/CALCULATE(SUM(ResellerSales_USD[SalesAmount_USD]),DateTime[Cal endarYear]=2007),BLANK()) Comments 1. After creating the measure you should have an empty result under [ResellerSales compared to 2007], as shown below: ResellerSales compared to 2007 The BLANK cell in the result is because you don't have single year filters anywhere in your context. 2. Drag DateTime[CalendarYear] to the Column Labels box; your table should look like this: Column Labels ResellerSales compared to 2007 2005 2006 2007 2008 24.83 % 74.88 % 100.00 % 50.73 % 3. Drag ProductCategory[ProductCategoryName] to the Row Labels box to have something like this: ResellerSales compared to 2007 Row Labels Column Labels 2005 2006 2007 2008 Accessories 6.74 % 31.40 % 100.00 % 55.58 % Bikes 28.69 % 77.92 % 100.00 % 53.46 % Clothing 3.90 % 55.86 % 100.00 % 44.92 % Components 11.05 % 65.99 % 100.00 % 38.65 % Grand Total 24.83 % 74.88 % 100.00 % 50.73 % 140 Did you notice that Grand Totals appeared at the bottom of the columns but not for the rows? This is because the context for Grand Totals on rows implies more than one year; but for columns implies a single year. 4. Drag DateTime[CalendarYear] to the Horizontal Slicers box, and drag SalesTerritory[SalesTerritoryGroup] to the Horizontal Labels box. You should have an empty results set, because your table contains data for multiple years. Select 2006 in the slicer and your table should now have data again. Try other years to see how the results change. 5. In summary, HASONEVALUE() allows you to identify if your expression is being evaluated in the context of a single value for columnName. ISCROSSFILTERED Function Returns TRUE when columnName or another column in the same or related table is being filtered. Syntax ISCROSSFILTERED(<columnName>) Parameters Parameter Description The name of an existing column, using standard DAX syntax. It cannot be an expression. Return Value TRUE when columnName or another column in the same or related table is being filtered. Otherwise returns FALSE. Remarks • A column is said to be cross-filtered when a filter applied to another column in the same table or in a related table affects columnName by filtering it. A column is said to be filtered directly when the filter or filters apply over the column. • The related function ISFILTERED Function (DAX) returns TRUE when columnName is filtered directly. Example Description The following example creates a measure and then presents different scenarios to explain the behavior of ISCROSSFILTERED(). The scenarios can be followed by downloading the DAX_AdventureWorks spreadsheet. First, create the following measure [Is ProductName Cross Filtered] in the [Product] table. 141 Code =ISCROSSFILTERED(Product[ProductName]) Comments Understanding ISCROSSFILTERED(): 1. After you create the measure, the PivotTable should show that [Is ProductName Cross Filtered] is FALSE, because the expression is not being filtered at all. Now, you should have something like this: Is ProductName Cross Filtered FALSE If nothing appears in the PivotTable, drag the column [Is ProductName Cross Filtered] to the Values box. 2. Drag DateTime[CalendarYear] to the Column Labels box and drag SalesTerritory[SalesTerritoryGroup] to the Row Labels box; all values should appear as FALSE. Now, you should have something like this: Is Product Name CrossFiltered Column Labels Row Labels 2005 2006 2007 2008 Europe FALSE FALSE FALSE FALSE FALSE FALSE NA FALSE FALSE FALSE FALSE FALSE FALSE North America FALSE FALSE FALSE FALSE FALSE FALSE Pacific FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE Grand Total Grand Total You are seeing the value FALSE in all cells because neither DateTime[CalendarYear] or SalesTerritory[SalesTerritoryGroup] have any filtering effect over Product[ProductName]. 3. Drag the column ProductCategory[ProductCategoryName] to the Slicers Horizontal box and ProductSubCategory[ProductSubCategoryName] to the Slicers Vertical box. All values should still appear as FALSE, because when you add a column to the slicers 142 box you haven't yet selected a slicing set. Therefore, you should have something like this: ProductCategory Name Accessories Bikes Clothing Compon ents ProductSubcategor yName Is Product Name CrossFiltered Column Labels Bib-Shorts Row Labels 2005 200 6 200 7 200 8 Bike-Racks Europe FALSE FAL SE FAL SE FAL SE FAL SE FAL SE Bike-Stands NA FALSE FAL SE FAL SE FAL SE FAL SE FAL SE Bottles and Cages North America FALSE FAL SE FAL SE FAL SE FAL SE FAL SE Bottom Brackets Pacific FALSE FAL SE FAL SE FAL SE FAL SE FAL SE FALSE FAL SE FAL SE FAL SE FAL SE FAL SE FALSE FAL SE FAL SE FAL SE FAL SE FAL SE Brakes Caps Grand Total Gra nd Tota l Chains Cleaners Cranksets Derailleurs Fenders Forks 143 Gloves Handlebars Headsets 4. Select any item in the slicers and your table will now turn all cells to TRUE because you are now filtering the Product[ProductName] column through the related tables ProductCategory and ProductSubcategory. Your results should look like this: ProductCategory Name Accessories Bikes Clothing Compone nts ProductSubcategory Is Product Name Name CrossFiltered Column Labels Bib-Shorts Row Labels 2005 200 200 200 6 7 8 Bike-Racks Europe TRUE TRU TRU TRU TRU TRU E E E E E Bike-Stands NA TRUE TRU TRU TRU TRU TRU E E E E E Bottles and Cages North America TRUE TRU TRU TRU TRU TRU E E E E E Bottom Brackets Pacific TRUE TRU TRU TRU TRU TRU E E E E E TRUE TRU TRU TRU TRU TRU E E E E E TRUE TRU TRU TRU TRU TRU E E E E E Brakes Caps Grand Total Gran d Tota l Chains 144 Cleaners Cranksets Derailleurs Fenders Forks Gloves Handlebars Headsets 5. You can now replace the slicers with Product[ProductName] and Product[ModelName]. As long as you do not select any item on any slicer the measure returns FALSE; however, when you select an item in the slicer, the measure now returns TRUE because you are filtering Product[ProductName] by itself or by selecting a Product[ModelName]. 6. In conclusion, ISCROSSFILTERED() allows you to determine if columnName is being filtered in the context where your DAX expression is being evaluated. This example uses the DAX_AdventureWorks sample spreadsheet model. See Also ISFILTERED Function (DAX) FILTERS Function (DAX) HASONEFILTER Function (DAX) HASONEVALUE Function (DAX) ISFILTERED Function Returns TRUE when columnName is being filtered directly. If there is no filter on the column or if the filtering happens because a different column in the same table or in a related table is being filtered then the function returns FALSE. Syntax ISFILTERED(<columnName>) Parameters Parameter Description The name of an existing column, using standard DAX syntax. It 145 cannot be an expression. Return Value TRUE when columnName is being filtered directly. Remarks • columnName is said to be filtered directly when the filter or filters apply over the column; a column is said to be cross-filtered when a filter applied to another column in the same table or in a related table affects columnName the column by filtering it as well. • The related function ISCROSSFILTERED Function (DAX) returns TRUE when columnName or another column in the same or related table is being filtered. Example Description The following example creates a measure and then presents different scenarios to explain the behavior of ISFILTERED(). The scenarios can be followed by downloading the Data Analysis Expressions (DAX) Sample Data spreadsheet. First, create the following measure [Is ProductName Filtered directly] in the [Product] table. Code =ISFILTERED(Product[ProductName]) Comments Understanding ISFILTERED(): 1. After you create the measure, the pivot table should show that [Is ProductName Filtered directly] is FALSE, because the expression is not being filtered at all. Now, you should have something like this: Is ProductName Filtered directly FALSE If nothing appears in the pivot table, drag [Is ProductName Filtered directly] to the Values box. 2. Drag ProductCategory[ProductCategoryName] to the Row Labels box; all values should still be FALSE and your table should look something like this: Row Labels Is ProductName Filtered directly Accessories FALSE 146 Bikes FALSE Clothing FALSE Components FALSE FALSE Grand Total FALSE The reason the table contains values of FALSE is because ProductCategory[ProductCategoryName] filters indirectly or cross-filters Product[ProductName], but is not a direct filter on the column. 3. Drag Product[Status] to the Column Labels box; all values should still be FALSE and your table should look something like this: Is ProductName Filtered directly Column Labels Row Labels Current Grand Total Accessories FALSE FALSE FALSE Bikes FALSE FALSE FALSE Clothing FALSE FALSE FALSE Components FALSE FALSE FALSE FALSE FALSE FALSE Grand Total FALSE FALSE FALSE The table still has many values of FALSE because Product[Status] doesn't filter Product[Name] directly. 4. The last step in this process is to drag Product[Name] to the Report Filter box. At this point nothing should have changed; however, once you select a product name, the table values should change to TRUE. Depending on the product you selected your table should look like this: ProductName Is ProductName Mountain-400-W Silver, 38 Column Labels 147 Filtered directly Row Labels Current Grand Total Accessories TRUE TRUE Bikes TRUE TRUE Clothing TRUE TRUE Components TRUE TRUE TRUE TRUE Grand Total TRUE TRUE 5. In conclusion, ISFILTERED() allows you to determine if columnName is being filtered directly in the context where your expression is being evaluated. This example uses the DAX_AdventureWorks sample spreadsheet model See Also ISCROSSFILTERED Function (DAX) FILTERS Function (DAX) HASONEFILTER Function (DAX) HASONEVALUE Function (DAX) KEEPFILTERS Function Modifies how filters are applied while evaluating a CALCULATE or CALCULATETABLE function. Syntax KEEPFILTERS(<expression>) Parameters Term Definition expression Any expression. Return Value No return value. Remarks 148 You use KEEPFILTERS within the context CALCULATE and CALCULATETABLE functions, to override the standard behavior of those functions. By default, filter arguments s in functions such as CALCULATE are used as the context for evaluating the expression, and as such filter arguments for CALCULATE replace all existing filters over the same columns. The new context effected by the filter argument for CALCULATE affects only existing filters on columns mentioned as part of the filter argument. Filters on columns other than those mentioned in the arguments of CALCULATE or other related functions remain in effect and unaltered. The KEEPFILTERS function allows you to modify this behavior. When you use KEEPFILTERS, any existing filters in the current context are compared with the columns in the filter arguments, and the intersection of those arguments is used as the context for evaluating the expression. The net effect over any one column is that both sets of arguments apply: both the filter arguments used in CALCULATE and the filters in the arguments of the KEEPFILTER function. In other words, whereas CALCULATE filters replace the current context, KEEPFILTERS adds filters to the current context. Example Description The following example takes you through some common scenarios that demonstrate use of the KEEPFILTERS function as part of a CALCULATE or CALCULATETABLE formula. The first three expressions obtain simple data to be used for comparisons: • Internet Sales for the state of Washington. • Internet Sales for the states of Washington and Oregon (both states combined). • Internet Sales for the state of Washington and the province of British Columbia (both regions combined). The fourth expression calculates Internet Sales for Washington and Oregon, while the filter for Washington and British Columbia is applied. The next expression calculates Internet Sales for Washington and Oregon but uses KEEPFILTERS; the filter for Washington and British Columbia is part of the prior context. Code EVALUATE ROW( "$$ in WA" , CALCULATE('Internet Sales'[Internet Total Sales] , 'Geography'[State Province Code]="WA" ) , "$$ in WA and OR" , CALCULATE('Internet Sales'[Internet Total Sales] , 'Geography'[State Province Code]="WA" 149 || 'Geography'[State Province Code]="OR" ) , "$$ in WA and BC" , CALCULATE('Internet Sales'[Internet Total Sales] , 'Geography'[State Province Code]="WA" || 'Geography'[State Province Code]="BC" ) , "$$ in WA and OR ??" , CALCULATE( CALCULATE('Internet Sales'[Internet Total Sales] ,'Geography'[State Province Code]="WA" || 'Geography'[State Province Code]="OR" ) , 'Geography'[State Province Code]="WA" || 'Geography'[State Province Code]="BC" ) , "$$ in WA !!" , CALCULATE( CALCULATE('Internet Sales'[Internet Total Sales] , KEEPFILTERS('Geography'[State Province Code]="WA" || 'Geography'[State Province Code]="OR" ) ) , 'Geography'[State Province Code]="WA" || 'Geography'[State Province Code]="BC" ) ) Comments When this expression is evaluated against the sample database AdventureWorks DW Tabular 2012, the following results are obtained. 150 Column Value [$$ in WA] $ 2,467,248.34 [$$ in WA and OR] $ 3,638,239.88 [$$ in WA and BC] $ 4,422,588.44 [$$ in WA and OR ??] $ 3,638,239.88 [$$ in WA !!] $ 2,467,248.34 Note The above results were formatted to a table, instead of a single row, for educational purposes. First, examine the expression, [$$ in WA and OR ??]. You might wonder how this formula could return the value for sales in Washington and Oregon, since the outer CALCULATE expression includes a filter for Washington and British Columbia. The answer is that the default behavior of CALCULATE overrides the outer filters in 'Geography'[State Province Code] and substitutes its own filter arguments, because the filters apply to the same column. Next, examine the expression, [$$ in WA !!]. You might wonder how this formula could return the value for sales in Washington and nothing else, since the argument filter includes Oregon and the outer CALCULATE expression includes a filter in Washington and British Columbia. The answer is that KEEPFILTERS modifies the default behavior of CALCULATE and adds an additional filter. Because the intersection of filters is used, now the outer filter 'Geography'[State Province Code]="WA" || 'Geography'[State Province Code]="BC") is added to the filter argument 'Geography'[State Province Code]="WA" || 'Geography'[State Province Code]="OR",. Because both filters apply to the same column, the resulting filter 'Geography'[State Province Code]="WA" is the filter that is applied when evaluating the expression. See Also Filter and value functions CALCULATE CALCULATETABLE RELATED Function Returns a related value from another table. Syntax RELATED(<column>) 151 Parameters Term Definition column The column that contains the values you want to retrieve. Return Value A single value that is related to the current row. Remarks The RELATED function requires that a relationship exists between the current table and the table with related information. You specify the column that contains the data that you want, and the function follows an existing many-to-one relationship to fetch the value from the specified column in the related table. If a relationship does not exist, you must create a relationship. For more information, see Creating a Relationship. When the RELATED function performs a lookup, it examines all values in the specified table regardless of any filters that may have been applied. Note The RELATED function needs a row context; therefore, it can only be used in calculated column expression, where the current row context is unambiguous, or as a nested function in an expression that uses a table scanning function. A table scanning function, such as SUMX, gets the value of the current row value and then scans another table for instances of that value. Example Description In the following example, the measure Non USA Internet Sales is created to produce a sales report that excludes sales in the United States. In order to create the measure, the InternetSales_USD table must be filtered to exclude all sales that belong to the United States in the SalesTerritory table. The United States, as a country, appears 5 times in the SalesTerritory table; once for each of the following regions: Northwest, Northeast, Central, Southwest, and Southeast. The first approach to filter the Internet Sales, in order to create the measure, could be to add a filter expression like the following: FILTER('InternetSales_USD', 'InternetSales_USD'[SalesTerritoryKey]<>1 && 'InternetSales_USD'[SalesTerritoryKey]<>2 && 'InternetSales_USD'[SalesTerritoryKey]<>3 && 'InternetSales_USD'[SalesTerritoryKey]<>4 && 'InternetSales_USD'[SalesTerritoryKey]<>5) 152 However, this approach is counterintuitive, prone to typing errors, and might not work if any of the existing regions is split in the future. A better approach would be to use the existing relationship between InternetSales_USD and SalesTerritory and explicitly state that the country must be different from the United States. To do so, create a filter expression like the following: FILTER( 'InternetSales_USD', RELATED('SalesTerritory'[SalesTerritoryCountry])<>"United States") This expression uses the RELATED function to lookup the country value in the SalesTerritory table, starting with the value of the key column, SalesTerritoryKey, in the InternetSales_USD table. The result of the lookup is used by the filter function to determine if the InternetSales_USD row is filtered or not. Note If the example does not work, you might need to create a relationship between the tables. For more information, see Relationships Between Tables. Code = SUMX(FILTER( 'InternetSales_USD' , RELATED('SalesTerritory'[SalesTerritoryCountry]) <>"United States" ) ,'InternetSales_USD'[SalesAmount_USD]) Comments The following table shows only totals for each region, to prove that the filter expression in the measure, Non USA Internet Sales, works as intended. Row Labels Internet Sales Non USA Internet Sales Australia $4,999,021.84 $4,999,021.84 Canada $1,343,109.10 $1,343,109.10 France $2,490,944.57 $2,490,944.57 Germany $2,775,195.60 $2,775,195.60 United Kingdom $5,057,076.55 $5,057,076.55 United States $9,389,479.79 Grand Total $26,054,827.45 $16,665,347.67 The following table shows the final report that you might get if you used this measure in a PivotTable: 153 Non USA Column Labels Internet Sales Row Labels Accessories Bikes Clothing Grand Total 2005 $1,526,481.95 $1,526,481.95 2006 $3,554,744.04 $3,554,744.04 2007 $156,480.18 $5,640,106.05 $70,142.77 $5,866,729.00 2008 $228,159.45 $5,386,558.19 $102,675.04 $5,717,392.68 $16,107,890.23 $172,817.81 $16,665,347.67 Grand Total $384,639.63 See Also RELATEDTABLE Filter and value functions Relationships between tables RELATEDTABLE Function Evaluates a table expression in a context modified by the given filters. Syntax RELATEDTABLE(<tableName>) Parameters Term Definition tableName The name of an existing table using standard DAX syntax. It cannot be an expression. Return Value A table of values. Remarks The RELATEDTETABLE function changes the context in which the data is filtered, and evaluates the expression in the new context that you specify. This function is a shortcut for CALCULATETABLE function with no logical expression. 154 Example Description The following example uses the RELATEDTABLE function to create a calculated column with the Internet Sales in the Product Category table. The following table shows the results of using the code shown here. Product Category Key Product Category AlternateKey Product Category Name Internet Sales 1 1 Bikes $28,318,144.65 2 2 Components 3 3 Clothing $339,772.61 4 4 Accessories $700,759.96 Code = SUMX( RELATEDTABLE('InternetSales_USD') , [SalesAmount_USD]) See Also CALCULATETABLE Function (DAX) Filter and value functions Relationships between tables USERELATIONSHIP Function Specifies the relationship to be used in a specific calculation as the one that exists between columnName1 and columnName2. Syntax USERELATIONSHIP(<columnName1>,<columnName2>) Parameters Parameter Description The name of an existing column, using standard DAX syntax and fully qualified, that usually represents the many side of the relationship to be used; if the arguments are given in reverse 155 order the function will swap them before using them. This argument cannot be an expression. The name of an existing column, using standard DAX syntax and fully qualified, that usually represents the one side or lookup side of the relationship to be used; if the arguments are given in reverse order the function will swap them before using them. This argument cannot be an expression. Return Value The function returns no value; the function only enables the indicated relationship for the duration of the calculation. Remarks 1. USERELATIONSHIP can only be used in functions that take a filter as an argument, for example: CALCULATE, CALCULATETABLE, CLOSINGBALANCEMONTH, CLOSINGBALANCEQUARTER, CLOSINGBALANCEYEAR, OPENINGBALANCEMONTH, OPENINGBALANCEQUARTER, OPENINGBALANCEYEAR, TOTALMTD, TOTALQTD and TOTALYTD functions. 2. USERELATIONSHIP uses existing relationships in the model, identifying relationships by their ending point columns. 3. In USERELATIONSHIP, the status of a relationship is not important; that is, whether the relationship is active or not does not affect the usage of the function. Even if the relationship is inactive, it will be used and overrides any other active relationships that might be present in the model but not mentioned in the function arguments. 4. An error is returned if any of the columns named as an argument is not part of a relationship or the arguments belong to different relationships. 5. If multiple relationships are needed to join table A to table B in a calculation, each relationship must be indicated in a different USERELATIONSHIP function. 6. If CALCULATE expressions are nested, and more than one CALCULATE expression contains a USERELATIONSHIP function, then the innermost USERELATIONSHIP is the one that prevails in case of a conflict or ambiguity. 7. Up to 10 USERELATIONSHIP functions can be nested; however, your expression might have a deeper level of nesting, ie. the following sample expression is nested 3 levels deep but only 2 for USEREALTIONSHIP: =CALCULATE(CALCULATE( CALCULATE( <anyExpression>, USERELATIONSHIP( t1[colA], t2[colB])), t99[colZ]=999), USERELATIONSHIP( t1[colA], t2[colA])). 156 Example Description The following sample shows how to override the default, active, relationship between InternetSales and DateTime tables. The default relationship exists between the OrderDate column, in the InternetSales table, and the Date column, in the DateTime table. To calculate the sum of internet sales and allow slicing by ShippingDate instead of the traditional OrderDate you need to create a measure, [InternetSales by ShippingDate] using the following expression: Code =CALCULATE(SUM(InternetSales[SalesAmount]), USERELATIONSHIP(InternetSales[ShippingDate], DateTime[Date])) Comments In PowerPivot: drag your new measure to the Values area in the right pane, drag the InternetSales[ShippingDate] column to the Row Labels area; you now have Internet Sales sliced by shipping date instead of by order date as is usually shown in these examples. For this example to work the relationships between InternetSales[ShipmentDate] and DateTime[Date] must exist and should not be the active relationship; also, the relationship between InternetSales[OrderDate] and DateTime[Date] should exist and should be the active relationship. VALUES Function Returns a one-column table that contains the distinct values from the specified column. In other words, duplicate values are removed and only unique values are returned. Note This function cannot be used to return values into a cell or column on a worksheet; rather, you use it as an intermediate function, nested in a formula, to get a list of distinct values that can be counted, or used to filter or sum other values. Syntax VALUES(<column>) Parameters Term Definition column The column from which unique values are 157 Term Definition to be returned. Return Value A column of unique values. Remarks When you use the VALUES function in a context that has been filtered, such as in a PivotTable, the unique values returned by VALUES are affected by the filter. For example, if you filter by Region, and return a list of the values for City, the list will include only those cities in the regions permitted by the filter. To return all of the cities, regardless of existing filters, you must use the ALL function to remove filters from the table. The second example demonstrates use of ALL with VALUES. Related Functions In most scenarios, the results of the VALUES function are identical to those of the DISTINCT function. Both functions remove duplicates and return a list of the possible values in the specified column. However, the VALUES function can also return an Unknown member. This unknown value is useful in cases where you are looking up distinct values from a related table, but a value used in the relationship is missing from one table. In database terminology, this is termed a violation of referential integrity. Such mismatches in data can easily occur when one table is being updated and the related table is not. The following table summarizes the mismatch between data that can occur in two related tables when referential integrity is not preserved. MyOrders table MySales table June 1 June 1 sales June 2 June 2 sales (no order dates have been entered) June 3 sales If you used the DISTINCT function to return a list of dates from the PivotTable containing these tables, only two dates would be returned. However, if you use the VALUES function, the function returns the two dates plus an additional blank member. Also, any row from the MySales table that does not have a matching date in the MyOrders table will be "matched" to this unknown member. Example Description 158 The following formula counts the number of unique invoices (sales orders), and produces the following results when used in a report that includes the Product Category Names: Row Labels Count Invoices Accessories 18,208 Bikes 15,205 Clothing 7,461 Grand Total 27,659 Code =COUNTROWS(VALUES('InternetSales_USD'[SalesOrderNumber])) See Also FILTER COUNTROWS Filter and value functions Information Functions An information function looks at the cell or row that is provided as an argument and tells you whether the value matches the expected type. For example, the ISERROR function returns TRUE if the value that you reference contains an error. In this Section CONTAINS Function ISBLANK Function ISERROR Function ISLOGICAL Function ISNONTEXT Function ISNUMBER Function ISTEXT Function LOOKUPVALUE Function PATH Function PATHCONTAINS Function PATHITEM Function PATHITEMREVERSE Function PATHLENGTH Function 159 See Also Function Reference (DAX) CONTAINS Function Returns true if values for all referred columns exist, or are contained, in those columns; otherwise, the function returns false. Syntax CONTAINS(<table>, <columnName>, <value>[, <columnName>, <value>]…) Parameters Parameter Description Any DAX expression that returns a table of data. The name of an existing column, using standard DAX syntax. It cannot be an expression. Any DAX expression that returns a single scalar value, that is to be sought in columnName. The expression is to be evaluated exactly once and before it is passed to the argument list. Return Value A value of TRUE if each specified value can be found in the corresponding columnName, or are contained, in those columns; otherwise, the function returns FALSE. Remarks • The arguments columnName and value must come in pairs; otherwise an error is returned. • columnName must belong to the specified table, or to a table that is related to table. • If columnName refers to a column in a related table then it must be fully qualified; otherwise, an error is returned. Example Description The following example creates a calculated measure that tells you whether there were any Internet sales of the product 214 and to customer 11185 at the same time. Code 160 =CONTAINS(InternetSales, [ProductKey], 214, [CustomerKey], 11185) Comments CUSTOMDATA Function Returns the content of the CustomData property in the connection string. Syntax CUSTOMDATA() Return Value The content of the CustomData property in the connection string. Blank, if CustomData property was not defined at connection time. Exceptions Remarks Example Description The following DAX code verifies if the CustomData property was set to "OK". Code =IF(CUSTOMDATA()="OK", "Correct Custom data in connection string", "No custom data in connection string property or unexpected value") Comments ISBLANK Function Checks whether a value is blank, and returns TRUE or FALSE. Syntax ISBLANK(<value>) Parameters Term Definition value The value or expression you want to test. 161 Return Value A Boolean value of TRUE if the value is blank; otherwise FALSE. Example Description This formula computes the increase or decrease ratio in sales compared to the previous year. The example uses the IF function to check the value for the previous year's sales in order to avoid a divide by zero error. Row Labels Total Sales Total Sales Previous Year Sales to Previous Year Ratio 2005 $10,209,985.08 2006 $28,553,348.43 $10,209,985.08 179.66% 2007 $39,248,847.52 $28,553,348.43 37.46% 2008 $24,542,444.68 $39,248,847.52 -37.47% Grand Total $102,554,625.71 Code //Sales to Previous Year Ratio =IF( ISBLANK('CalculatedMeasures'[PreviousYearTotalSales]) , BLANK() , ( 'CalculatedMeasures'[Total Sales]'CalculatedMeasures'[PreviousYearTotalSales] ) /'CalculatedMeasures'[PreviousYearTotalSales]) See Also Information functions (DAX) ISERROR Function Checks whether a value is an error, and returns TRUE or FALSE. Syntax ISERROR(<value>) Parameters 162 Term Definition value The value you want to test. Return Value A Boolean value of TRUE if the value is an error; otherwise FALSE. Example Description The following example calculates the ratio of total Internet sales to total reseller sales. The ISERROR function is used to check for errors, such as division by zero. If there is an error a blank is returned, otherwise the ratio is returned. Code = IF( ISERROR( SUM('ResellerSales_USD'[SalesAmount_USD]) /SUM('InternetSales_USD'[SalesAmount_USD]) ) , BLANK() , SUM('ResellerSales_USD'[SalesAmount_USD]) /SUM('InternetSales_USD'[SalesAmount_USD]) ) See Also Information functions (DAX) IFERROR IF ISLOGICAL Function Checks whether a value is a logical value, (TRUE or FALSE), and returns TRUE or FALSE. Syntax ISLOGICAL(<value>) Parameters Term Definition value The value that you want to test. 163 Property Value/Return Value TRUE if the value is a logical value; FALSE if any value other than TRUE OR FALSE. Example Description The following three samples show the behavior of ISLOGICAL. Code //RETURNS: Is Boolean type or Logical =IF(ISLOGICAL(true), "Is Boolean type or Logical", "Is different type") //RETURNS: Is Boolean type or Logical =IF(ISLOGICAL(false), "Is Boolean type or Logical", "Is different type") //RETURNS: Is different type =IF(ISLOGICAL(25), "Is Boolean type or Logical", "Is different type") See Also Information functions (DAX) ISNONTEXT Function Checks if a value is not text (blank cells are not text), and returns TRUE or FALSE. Syntax ISNONTEXT(<value>) Parameters Term Definition value The value you want to check. Return Value TRUE if the value is not text or blank; FALSE if the value is text. Remarks An empty string is considered text. Example 164 Description The following examples show the behavior of the ISNONTEXT function. Code //RETURNS: Is Non-Text =IF(ISNONTEXT(1), "Is Non-Text", "Is Text") //RETURNS: Is Non-Text =IF(ISNONTEXT(BLANK()), "Is Non-Text", "Is Text") //RETURNS: Is Text =IF(ISNONTEXT(""), "Is Non-Text", "Is Text") See Also Information functions (DAX) ISNUMBER Function Checks whether a value is a number, and returns TRUE or FALSE. Syntax ISNUMBER(<value>) Parameters Term Definition value The value you want to test. Property Value/Return Value TRUE if the value is numeric; otherwise FALSE. Example Description The following three samples show the behavior of ISNUMBER. Code //RETURNS: Is number =IF(ISNUMBER(0), "Is number", "Is Not number") 165 //RETURNS: Is number =IF(ISNUMBER(3.1E-1),"Is number", "Is Not number") //RETURNS: Is Not number =IF(ISNUMBER("123"), "Is number", "Is Not number") Comments See Also Information functions ISTEXT Function Checks if a value is text, and returns TRUE or FALSE. Syntax ISTEXT(<value>) Parameters Term Definition value The value you want to check. Property Value/Return Value TRUE if the value is text; otherwise FALSE Example Description The following examples show the behavior of the ISTEXT function. Code //RETURNS: Is Text =IF(ISTEXT("text"), "Is Text", "Is Non-Text") //RETURNS: Is Text =IF(ISTEXT(""), "Is Text", "Is Non-Text") //RETURNS: Is Non-Text =IF(ISTEXT(1), "Is Text", "Is Non-Text") 166 //RETURNS: Is Non-Text =IF(ISTEXT(BLANK()), "Is Text", "Is Non-Text") See Also Information functions (DAX) LOOKUPVALUE Function Returns the value in result_columnName for the row that meets all criteria specified by search_columnName and search_value. Syntax LOOKUPVALUE( <result_columnName>, <search_columnName>, <search_value>[, <search_columnName>, <search_value>]…) Parameters Parameter Description The name of an existing column that contains the value you want to return. The column must be named using standard DAX syntax, usually, fully qualified. It cannot be an expression. The name of an existing column, in the same table as result_columnName or in a related table, over which the look-up is performed. The column must be named using standard DAX syntax, usually, fully qualified. It cannot be an expression. A scalar expression that does not refer to any column in the same table being searched. Return Value The value of result_column at the row where all pairs of search_column and search_value have a match. If there is no match that satisfies all the search values, a BLANK is returned. In other words, the function will not return a lookup value if only some of the criteria match. 167 If multiple rows match the search values and in all cases result_column values are identical then that value is returned. However, if result_column returns different values an error is returned. Remarks Example Description The following example returns the SafetyStocklLevel for the bike model "Mountain-400W Silver, 46". Code =LOOKUPVALUE(Product[SafetyStockLevel], [ProductName], " Mountain-400-W Silver, 46") Comments PATH Function Returns a delimited text string with the identifiers of all the parents of the current identifier, starting with the oldest and continuing until current. Syntax PATH(<ID_columnName>, <parent_columnName>) Parameters Parameter Description The name of an existing column containing the unique identifier for rows in the table. This cannot be an expression. The data type of the value in ID_columnName must be text or integer, and must also be the same data type as the column referenced in parent_columnName. The name of an existing column containing the unique identifier for the parent of the current row. This cannot be an expression. The data type of the value in parent_columnName data type must be text or integer, and must 168 be the same data type as the value in ID_columnName. Return Value A delimited text string containing the identifiers of all the parents to the current identifier. Remarks This function is used in tables that have some kind of internal hierarchy, to return the items that are related to the current row value. For example, in an Employees table that contains employees, the managers of employees, and the managers of the managers, you can return the path that connects an employee to his or her manager. The path is not constrained to a single level of parent-child relationships; it can return related rows that are several levels up from the specified starting row. The delimiter used to separate the ascendants is the vertical bar, '|'. The values in ID_columnName and parent_columnName must have the same data type, text or integer. Values in parent_columnName must be present in ID_columnName. That is, you cannot look up a parent if there is no value at the child level. If parent_columnName is BLANK then PATH() returns ID_columnName value. In other words, if you look for the manager of an employee but the parent_columnName column has no data, the PATH function returns just the employee ID. If ID_columnName has duplicates and parent_columnName is the same for those duplicates then PATH() returns the common parent_columnName value; however, if parent_columnName value is different for those duplicates then PATH() returns an error. In other words, if you have two listings for the same employee ID and they have the same manager ID, the PATH function returns the ID for that manager. However, if there are two identical employee IDs that have different manager IDs, the PATH function returns an error. If ID_columnName is BLANK then PATH() returns BLANK. If ID_columnName contains a vertical bar '|' then PATH() returns an error. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following example creates a calculated column that lists all the managers for each employee. Code 169 =PATH(Employee[EmployeeKey], Employee[ParentEmployeeKey]) Comments PATHCONTAINS Function Returns TRUE if the specified item exists within the specified path. Syntax PATHCONTAINS(<path>, <item>) Parameters Parameter Description A string created as the result of evaluating a PATH function. A text expression to look for in the path result. Return Value A value of TRUE if item exists in path; otherwise FALSE. Remarks If item is an integer number it is converted to text and then the function is evaluated. If conversion fails then the function returns an error. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following example creates a calculated column that takes a manager ID and checks a set of employees. If the manager ID is among the list of managers returned by the PATH function, the PATHCONTAINS function returns true; otherwise it returns false. Code =PATHCONTAINS(PATH(Employee[EmployeeKey], Employee[ParentEmployeeKey]), "23") Comments 170 PATHITEM Function Returns the item at the specified position from a string resulting from evaluation of a PATH function. Positions are counted from left to right. Syntax PATHITEM(<path>, <position>[, <type>]) Parameters Parameter Description A text string in the form of the results of a PATH function. An integer expression with the position of the item to be returned. (Optional)An enumeration that defines the data type of the result: Enumeration Alternate Description Enumeration TEXT 0 Results are returned with the data type text. (default). INTEGER 1 Results are returned as integers. Return Value The identifier returned by the PATH function at the specified position in the list of identifiers. Items returned by the PATH function are ordered by most distant to current. Remarks This function can be used to return a specific level from a hierarchy returned by a PATH function. For example, you could return just the skip-level managers for all employees. If you specify a number for position that is less than one (1) or greater than the number of elements in path, the PATHITEM function returns BLANK 171 If type is not a valid enumeration element an error is returned. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following example returns the third tier manager of the current employee; it takes the employee and manager IDs as the input to a PATH function that returns a string with the hierarchy of parents to current employee. From that string PATHITEM returns the third entry as an integer. Code =PATHITEM(PATH(Employee[EmployeeKey], Employee[ParentEmployeeKey]), 3, 1) Comments PATHITEMREVERSE Function Returns the item at the specified position from a string resulting from evaluation of a PATH function. Positions are counted backwards from right to left. Syntax PATHITEMREVERSE(<path>, <position>[, <type>]) Parameters Parameter Description A text string resulting from evaluation of a PATH function. An integer expression with the position of the item to be returned. Position is counted backwards from right to left. (Optional) An enumeration that defines the data type of the result: Enumeration Alternate Description Enumeration TEXT 0 Results are 172 returned with the data type of text. (default) INTEGER 1 Results are returned with the data type of integer. Return Value The n-position ascendant in the given path, counting from current to the oldest. Remarks • This function can be used to get an individual item from a hierarchy resulting from a PATH function. • This function reverses the standard order of the hierarchy, so that closest items are listed first, For example, if the PATh function returns a list of managers above an employee in a hierarchy, the PATHITEMREVERSE function returns the employee’s immediate manager in position 2 because position 1 contains the employee’s id. • If the number specified for position is less than one (1) or greater than the number of elements in path, the PATHITEM function returns BLANK. • If type is not a valid enumeration element an error is returned. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following example takes an employee ID column as the input to a PATH function, and reverses the list of grandparent elements that are returned. The position specified is 3 and the return type is 1; therefore, the PATHITEMREVERSE function returns an integer representing the manager two levels up from the employee. Code =PATHITEMREVERSE(PATH(Employee[EmployeeKey], Employee[ParentEmployeeKey]), 3, 1) Comments 173 PATHLENGTH Function Returns the number of parents to the specified item in a given PATH result, including self. Syntax PATHLENGTH(<path>) Parameters Parameter Description A text expression resulting from evaluation of a PATH function. Return Value The number of items that are parents to the specified item in a given PATH result, including the specified item. Remarks This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following example takes an employee ID as input to a PATH function and returns a list of the managers above that employee in the hierarchy, The PATHLENGTH function takes that result and counts the different levels of employees and managers, including the employee you started with. Code =PATHLENGTH(PATH(Employee[EmployeeKey], Employee[ParentEmployeeKey])) Comments USERNAME Function Returns the domain name and username from the credentials given to the system at connection time Syntax USERNAME() Parameters 174 Return Value The username from the credentials given to the system at connection time Exceptions Remarks Under Windows authentication, the returned string has the structure: <domainname>\<user-name> Example Description The following code verifies if the user login is part of the UsersTable. Code =IF(CONTAINS(UsersTable,UsersTable[login], USERNAME()), "Allowed", BLANK()) Comments Logical Functions Logical functions act upon an expression to return information about the values or sets in the expression. For example, you can use the IF function to check the result of an expression and create conditional results. In this Section AND Function FALSE Function IF Function IFERROR Function NOT Function OR Function SWITCH Function TRUE Function Reference Using DAX Basic DAX Syntax Related Sections Date and Time Functions (DAX) Aggregation Functions (DAX) 175 Logical Functions (DAX) Filter and Value Functions (DAX) Math and Trigonometric Functions (DAX) See Also Getting Started with Data Analysis Expressions (DAX) AND Function Checks whether both arguments are TRUE, and returns TRUE if both arguments are TRUE. Otherwise returns false. Syntax AND(<logical1>,<logical2>) Parameters Term Definition logical_1, logical_2 The logical values you want to test. Return Value Returns true or false depending on the combination of values that you test. Remarks The AND function in DAX accepts only two (2) arguments. If you need to perform an AND operation on multiple expressions, you can create a series of calculations or, better, use the AND operator (&&) to join all of them in a simpler expression. Example Description The following formula shows the syntax of the AND function. Code =IF(AND(10 > 9, -10 < -1), "All true", "One or more false" Comments Because both conditions, passed as arguments, to the AND function are true, the formula returns "All True". Example Description The following sample uses the AND function with nested formulas to compare two sets of calculations at the same time. For each product category, the formula determines if 176 the current year sales and previous year sales of the Internet channel are larger than the Reseller channel for the same periods. If both conditions are true, for each category the formula returns the value, "Internet hit". AND function Column Labels Row Labels 2005 2006 2007 2008 Grand Total Bib-Shorts Bike Racks Bike Stands Internet Hit Bottles and Cages Internet Hit Bottom Brackets Brakes Caps Chains Cleaners Cranksets Derailleurs Fenders Internet Hit Forks Gloves Handlebars Headsets Helmets Hydration Packs Jerseys Lights 177 AND function Column Labels Locks Mountain Bikes Mountain Frames Panniers Pedals Pumps Road Bikes Road Frames Saddles Shorts Socks Tights Tires and Tubes Internet Hit Touring Bikes Touring Frames Vests Wheels Grand Total Code = IF( AND( SUM( 'InternetSales_USD'[SalesAmount_USD]) >SUM('ResellerSales_USD'[SalesAmount_USD]) , CALCULATE(SUM('InternetSales_USD'[SalesAmount_USD]), PREVIOUSYEAR('DateTime'[DateKey] )) >CALCULATE(SUM('ResellerSales_USD'[SalesAmount_USD]), PREVIOUSYEAR('DateTime'[DateKey] )) ) 178 , "Internet Hit" , "" ) Comments See Also Logical Functions FALSE Function Returns the logical value FALSE. Syntax FALSE() Return Value Always FALSE. Remarks The word FALSE is also interpreted as the logical value FALSE. Example Description The formula returns the logical value FALSE when the value in the column, 'InternetSales_USD'[SalesAmount_USD], is less than or equal to 200000. The following table shows the results when the example formula is used with 'ProductCategory'[ProductCategoryName] in Row Labels and 'DateTime'[CalendarYear] in Column Labels. True-False Column Labels Row Labels 2005 2006 2007 2008 Accessories FALSE FALSE TRUE TRUE FALSE TRUE Bikes TRUE TRUE TRUE TRUE FALSE TRUE Clothing FALSE FALSE FALSE FALSE FALSE TRUE Components FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE TRUE TRUE TRUE TRUE FALSE TRUE Grand Total Grand Total 179 Code =IF(SUM('InternetSales_USD'[SalesAmount_USD]) >200000, TRUE(), false()) See Also TRUE NOT IF Function Reference IF Function Checks if a condition provided as the first argument is met. Returns one value if the condition is TRUE, and returns another value if the condition is FALSE. Syntax IF(logical_test>,<value_if_true>, value_if_false) Parameters Term Definition logical_test Any value or expression that can be evaluated to TRUE or FALSE. value_if_true The value that is returned if the logical test is TRUE. If omitted, TRUE is returned. value_if_false The value that is returned if the logical test is FALSE. If omitted, FALSE is returned. Return Value Any type of value that can be returned by an expression. Remarks If the value of value_if_true or value_if_false is omitted, IF treats it as an empty string value (""). If the value referenced in the expression is a column, IF returns the value that corresponds to the current row. The IF function attempts to return a single data type in a column. Therefore, if the values returned by value_if_true and value_if_false are of different data types, the IF function will implicitly convert data types to accommodate both values in the column. For example, the formula IF(<condition>,TRUE(),0) returns a column of ones and zeros 180 and the results can be summed, but the formula IF(<condition>,TRUE(),FALSE()) returns only logical values. For more information about implicit data type conversion, see Data Types in DAX. Example Description The following example uses nested IF functions that evaluate the number in the column, Calls, from the table FactCallCenter in Adventure Works DW Multidimensional 2012 . The function assigns a label as follows: low if the number of calls is less than 200, medium if the number of calls is less than 300 but not less than 200, and high for all other values. Code =IF([Calls]<200,"low",IF([Calls]<300,"medium","high")) Example Description The following example gets a list of cities that contain potential customers in the California area by using columns from the table ProspectiveBuyer in Adventure Works DW Multidimensional 2012 . Because the list is meant to plan for a campaign that will target married people or people with children at home, the condition in the IF function checks for the value of the columns [MaritalStatus] and [NumberChildrenAtHome], and outputs the city if either condition is met and if the customer is in California. Otherwise, it outputs the empty string. Code =IF([StateProvinceCode]= "CA" && ([MaritalStatus] = "M" || [NumberChildrenAtHome] >1),[City]) Comments Note that parentheses are used to control the order in which the AND (&&) and OR (||) operators are used. Also note that no value has been specified for value_if_false. Therefore, the function returns the default, which is an empty string. See Also TRUE FALSE NOT IF Function Reference IFERROR Function Evaluates an expression and returns a specified value if the expression returns an error; otherwise returns the value of the expression itself. 181 Syntax IFERROR(value, value_if_error) Parameters Term Definition value Any value or expression. value_if_error Any value or expression. Return Value A scalar of the same type as value Exceptions Remarks You can use the IFERROR function to trap and handle errors in an expression. If value or value_if_error is an empty cell, IFERROR treats it as an empty string value (""). The IFERROR function is based on the IF function, and uses the same error messages, but has fewer arguments. The relationship between the IFERROR function and the IF function as follows: IFERROR(A,B) := IF(ISERROR(A), B, A) Note that the values that are returned for A and B must be of the same data type; therefore, the column or expression used for value and the value returned for value_if_error must be the same data type. Example Description The following example returns 9999 if the expression 25/0 evaluates to an error. If the expression returns a value other than error, that value is passed to the invoking expression. Code =IFERROR(25/0,9999) Comments See Also Logical Functions NOT Function Changes FALSE to TRUE, or TRUE to FALSE. 182 Syntax NOT(<logical>) Parameters Term Definition logical A value or expression that can be evaluated to TRUE or FALSE. Return Value TRUE OR FALSE. Example Description The following example retrieves values from the calculated column that was created to illustrate the IF function. For that example, the calculated column was named using the default name, Calculated Column1, and contains the following formula: =IF([Orders]<300,"true","false") The formula checks the value in the column, [Orders], and returns "true" if the number of orders is under 300. Now create a new calculated column, Calculated Column2, and type the following formula. Code =NOT([CalculatedColumn1]) Comments For each row in Calculated Column1, the values "true" and "false" are interpreted as the logical values TRUE or FALSE, and the NOT function returns the logical opposite of that value. See Also TRUE FALSE IF Function Reference OR Function Checks whether one of the arguments is TRUE to return TRUE. The function returns FALSE if both arguments are FALSE. 183 Syntax OR(<logical1>,<logical2>) Parameters Term Definition logical_1, logical_2 The logical values you want to test. Return Value A Boolean value. The value is TRUE if any of the two arguments is TRUE; the value is FALSE if both the arguments are FALSE. Remarks The OR function in DAX accepts only two (2) arguments. If you need to perform an OR operation on multiple expressions, you can create a series of calculations or, better, use the OR operator (||) to join all of them in a simpler expression. The function evaluates the arguments until the first TRUE argument, then returns TRUE. Example Description The following example shows how to use the OR function to obtain the sales people that belong to the Circle of Excellence. The Circle of Excellence recognizes those who have achieved more than a million dollars in Touring Bikes sales or sales of over two and a half million dollars in 2007. SalesPersonFlag True OR function Column Labels Row Labels 2005 2006 2007 2008 Grand Total Abbas, Syed E Alberts, Amy E AnsmanWolfe, Pamela O 184 SalesPersonFlag True Blythe, Michael G Circle of Circle of Circle of Circle of Circle of Circle of Excellence Excellence Excellence Excellence Excellence Excellence Campbell, David R Carson, Jillian Circle of Circle of Circle of Circle of Circle of Circle of Excellence Excellence Excellence Excellence Excellence Excellence Ito, Shu K Jiang, Stephen Y MensaAnnan, Tete A Mitchell, Linda C Circle of Circle of Circle of Circle of Circle of Circle of Excellence Excellence Excellence Excellence Excellence Excellence Pak, Jae B Circle of Circle of Circle of Circle of Circle of Circle of Excellence Excellence Excellence Excellence Excellence Excellence Reiter, Tsvi Michael Saraiva, José Edvaldo Circle of Circle of Circle of Circle of Circle of Circle of Excellence Excellence Excellence Excellence Excellence Excellence Tsoflias, Lynn N Valdez, Rachel B Vargas, Garrett R Varkey Chudukatil, Ranjit R Circle of Excellence Grand Total Circle of Circle of Circle of Circle of Circle of Circle of Excellence Excellence Excellence Excellence Excellence Excellence Code 185 IF( OR( CALCULATE(SUM('ResellerSales_USD'[SalesAmount_USD]), 'ProductSubcategory'[ProductSubcategoryName]="Touring Bikes") > 1000000 , CALCULATE(SUM('ResellerSales_USD'[SalesAmount_USD]), 'DateTime'[CalendarYear]=2007) > 2500000 ) , "Circle of Excellence" , "" ) Comments See Also Logical functions SWITCH Function Evaluates an expression against a list of values and returns one of multiple possible result expressions. Syntax SWITCH(<expression>, <value>, <result>[, <value>, <result>]…[, <else>]) Parameters Parameter Description Any DAX expression that returns a single scalar value, where the expression is to be evaluated multiple times (for each row/context). A constant value to be matched with the results of expression. Any scalar expression to be evaluated if the results of expression match the corresponding value. Any scalar expression to be evaluated if the result of expression doesn't match any of the value arguments. 186 Return Value A scalar value coming from one of the result expressions, if there was a match with value, or from the else expression, if there was no match with any value. Exceptions Remarks All result expressions and the else expression must be of the same data type. Example Description The following example creates a calculated column of month names. Code =SWITCH([Month], 1, "January", 2, "February", 3, "March", 4, "April" , 5, "May", 6, "June", 7, "July", 8, "August" , 9, "September", 10, "October", 11, "November", 12, "December" , "Unknown month number" ) Comments TRUE Function Returns the logical value TRUE. Syntax TRUE() Return Value Always TRUE. Remarks The word TRUE is also interpreted as the logical value TRUE. Example Description The formula returns the logical value TRUE when the value in the column, 'InternetSales_USD'[SalesAmount_USD], is greater than 200000. The following table shows the results when the example formula is used in a PivotTable, with 'ProductCategory'[ProductCategoryName] in Row Labels and 'DateTime'[CalendarYear] in Column Labels. 187 True-False Column Labels Row Labels 2005 2006 2007 2008 Accessories FALSE FALSE TRUE TRUE FALSE TRUE Bikes TRUE TRUE TRUE TRUE FALSE TRUE Clothing FALSE FALSE FALSE FALSE FALSE TRUE Components FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE TRUE TRUE TRUE TRUE FALSE TRUE Grand Total Grand Total Code = IF(SUM('InternetSales_USD'[SalesAmount_USD]) >200000, TRUE(), false()) See Also FALSE NOT IF Function Reference Math and Trig Functions The mathematical functions in Data Analysis Expressions (DAX) are very similar to the Excel mathematical and trigonometric functions. This section lists the mathematical functions provided by DAX. The numeric data types used by DAX functions are described in the section, Data Types in DAX. In this Section ABS Function CEILING Function CURRENCY Function EXP Function FACT Function FLOOR Function 188 INT Function ISO.CEILING Function LN Function LOG Function LOG10 Function MOD Function MROUND Function PI Function POWER Function QUOTIENT Function RAND Function (DAX) RANDBETWEEN Function (DAX) ROUND Function ROUNDDOWN Function ROUNDUP Function SIGN Function SQRT Function SUM Function SUMX Function TRUNC Function Reference Using DAX Basic DAX Syntax Related Sections Date and Time Functions (DAX) Aggregation Functions (DAX) Logical Functions (DAX) Filter and Value Functions (DAX) Math and Trigonometric Functions (DAX) See Also Getting Started with Data Analysis Expressions (DAX) ABS Function Returns the absolute value of a number. 189 Syntax ABS(<number>) Parameters Term Definition number The number for which you want the absolute value. Return Value A decimal number. Remarks The absolute value of a number is a decimal number, whole or decimal, without its sign. You can use the ABS function to ensure that only non-negative numbers are returned from expressions when nested in functions that require a positive number. Example Description The following example returns the absolute value of the difference between the list price and the dealer price, which you might use in a new calculated column, DealerMarkup. Code =ABS([DealerPrice]-[ListPrice]) See Also Scalar math and trig functions SIGN function CEILING Function Rounds a number up, to the nearest integer or to the nearest multiple of significance. Syntax CEILING(<number>, <significance>) Parameters Term Definition number The number you want to round, or a reference to a column that contains 190 Term Definition numbers. significance The multiple of significance to which you want to round. For example, to round to the nearest integer, type 1. Return Value A number rounded as specified. Remarks There are two CEILING functions in DAX, with the following differences: • The CEILING function emulates the behavior of the CEILING function in Excel. • The ISO.CEILING function follows the ISO-defined behavior for determining the ceiling value. The two functions return the same value for positive numbers, but different values for negative numbers. When using a positive multiple of significance, both CEILING and ISO.CEILING round negative numbers upward (toward positive infinity). When using a negative multiple of significance, CEILING rounds negative numbers downward (toward negative infinity), while ISO.CEILING rounds negative numbers upward (toward positive infinity). The return type is usually of the same type of the significant argument, with the following exceptions: • If the number argument type is currency, the return type is currency. • If the significance argument type is Boolean, the return type is integer. • If the significance argument type is non-numeric, the return type is real. Example Description The following formula returns 4.45. This might be useful if you want to avoid using smaller units in your pricing. If an existing product is priced at $4.42, you can use CEILING to round prices up to the nearest unit of five cents. Code =CEILING(4.42,0.05) Example Description The following formula returns similar results as the previous example, but uses numeric values stored in the column, ProductPrice. Code =CEILING([ProductPrice],0.05) 191 See Also Math and Trig functions FLOOR function ISO.CEILING Function (DAX) ROUNDUP function CURRENCY Function Evaluates the argument and returns the result as currency data type. Syntax CURRENCY(<value>) Parameters Parameter Description Any DAX expression that returns a single scalar value where the expression is to be evaluated exactly once before all other operations. Return Value The value of the expression evaluated and returned as a currency type value. Remarks • The CURRENCY function rounds up the 5th significant decimal, in value, to return the 4th decimal digit; rounding up occurs if the 5th significant decimal is equal or larger than 5. For example, if value is 3.6666666666666 then converting to currency returns $3.6667; however, if value is 3.0123456789 then converting to currency returns $3.0123. • If the data type of the expression is TrueFalse then CURRENCY( <TrueFalse>) will return $1.0000 for True values and $0.0000 for False values. • If the data type of the expression is Text then CURRENCY(<Text>) will try to convert text to a number; if conversion succeeds the number will be converted to currency, otherwise an error is returned. • If the data type of the expression is DateTime then CURRENCY(<DateTime>) will convert the datetime value to a number and that number to currency. DateTime values have an integer part that represents the number of days between the given date and 1900-03-01 and a fraction that represents the fraction of a day (where 12 hours or noon is 0.5 day). If the value of the expression is not a proper DateTime value an error is returned. 192 Example Description Convert number 1234.56 to currency data type. Code =CURRENCY(1234.56) Comments Returns the value $1234.5600. EXP Function Returns raised to the power of a given number. The constant e equals 2.71828182845904, the base of the natural logarithm. Syntax EXP(<number>) Parameters Term Definition number The exponent applied to the base . The constant equals 2.71828182845904, the base of the natural logarithm. Return Value A decimal number. Exceptions Remarks EXP is the inverse of LN, which is the natural logarithm of the given number. To calculate powers of bases other than , use the exponentiation operator (^). For more information, see Operator Reference. Example Description The following formula calculates raised to the power of the number contained in the column, [Power]. Code =EXP([Power]) See Also 193 Scalar math and trig functions LN Function EXP LOG10 LOG FACT Function Returns the factorial of a number, equal to the series 1*2*3*...* , ending in the given number. Syntax FACT(<number>) Parameters Term Definition number The non-negative number for which you want to calculate the factorial. Return Value A decimal number. Remarks If the number is not an integer, it is truncated and an error is returned. If the result is too large, an error is returned. Example Description The following formula returns the factorial for the series of integers in the column, [Values]. Code =FACT([Values]) Comments The following table shows the expected results: 194 Values Results 0 1 1 1 2 2 3 6 4 24 5 120 170 7.257415615308E+306 See Also Scalar math and trig functions TRUNC FLOOR Function Rounds a number down, toward zero, to the nearest multiple of significance. Syntax FLOOR(<number>, <significance>) Parameters Term Definition number The numeric value you want to round. significance The multiple to which you want to round. The arguments number and significance must either both be positive, or both be negative. Return Value A decimal number. Remarks If either argument is nonnumeric, FLOOR returns #VALUE! error value. If number and significance have different signs, FLOOR returns the #NUM! error value. 195 Regardless of the sign of the number, a value is rounded down when adjusted away from zero. If the number is an exact multiple of significance, no rounding occurs. Example Description The following formula takes the values in the [Total Product Cost] column from the table, InternetSales.and rounds down to the nearest multiple of .1. Code =FLOOR(InternetSales[Total Product Cost],.5) Comments The following table shows the expected results for some sample values. Values Expected Result 10.8423 10.8 8.0373 8 2.9733 2.9 See Also Scalar math and trig functions INT Function Rounds a number down to the nearest integer. Syntax INT(<number>) Parameters Term Definition number The number you want to round down to an integer Return Value A whole number. Remarks 196 TRUNC and INT are similar in that both return integers. TRUNC removes the fractional part of the number. INT rounds numbers down to the nearest integer based on the value of the fractional part of the number. INT and TRUNC are different only when using negative numbers: TRUNC(-4.3) returns -4, but INT(-4.3) returns -5 because -5 is the lower number. Example Description The following expression rounds the value to 1. If you use the ROUND function, the result would be 2. Code =INT(1.5) See Also math and trig functions ROUND ROUNDUP ROUNDDOWN MROUND ISO.CEILING Function Rounds a number up, to the nearest integer or to the nearest multiple of significance. Syntax ISO.CEILING(<number>[, <significance>]) Parameters Term Definition number The number you want to round, or a reference to a column that contains numbers. significance (optional) The multiple of significance to which you want to round. For example, to round to the nearest integer, type 1. If the unit of significance is not specified, the number is rounded up to the nearest integer. 197 Return Value A number, of the same type as the number argument, rounded as specified. Remarks There are two CEILING functions in DAX, with the following differences: • The CEILING function emulates the behavior of the CEILING function in Excel. • The ISO.CEILING function follows the ISO-defined behavior for determining the ceiling value. The two functions return the same value for positive numbers, but different values for negative numbers. When using a positive multiple of significance, both CEILING and ISO.CEILING round negative numbers upward (toward positive infinity). When using a negative multiple of significance, CEILING rounds negative numbers downward (toward negative infinity), while ISO.CEILING rounds negative numbers upward (toward positive infinity). The result type is usually the same type of the significance used as argument with the following exceptions: • If the first argument is of currency type then the result will be currency type. • If the optional argument is not included the result is of integer type. • If the significance argument is of Boolean type then the result is of integer type. • If the significance argument is non-numeric type then the result is of real type. Example: Positive Numbers Description The following formula returns 4.45. This might be useful if you want to avoid using smaller units in your pricing. If an existing product is priced at $4.42, you can use ISO.CEILING to round prices up to the nearest unit of five cents. Code =ISO.CEILING(4.42,0.05) Example: Negative Numbers Description The following formula returns the ISO ceiling value of -4.40. Code =ISO.CEILING(-4.42,0.05) See Also Math and Trig functions FLOOR function CEILING Function (DAX) ROUNDUP function 198 LN Function Returns the natural logarithm of a number. Natural logarithms are based on the constant (2.71828182845904). Syntax LN(<number>) Parameters Term Definition number The positive number for which you want the natural logarithm. Return Value A decimal number. Remarks LN is the inverse of the EXP function. Example Description The following example returns the natural logarithm of the number in the column, [Values]. Code =LN([Values]) See Also Scalar math and trig functions EXP Function LOG Function Returns the logarithm of a number to the base you specify. Syntax LOG(<number>,<base>) Parameters 199 Term Definition number The positive number for which you want the logarithm. base The base of the logarithm. If omitted, the base is 10. Return Value A decimal number. Remarks You might receive an error if the value is too large to be displayed. The function LOG10 is similar, but always returns the common logarithm, meaning the logarithm for the base 10. Example Description The following formulas return the same result, 2. Code =LOG(100,10) =LOG(100) =LOG10(100) See Also Scalar math and trig functions EXP LOG10 LOG LOG10 Function Returns the base-10 logarithm of a number. Syntax LOG10(<number>) Parameters Term Definition number A positive number for which you want the 200 Term Definition base-10 logarithm. Return Value A decimal number. Remarks The LOG function lets you change the base of the logarithm, instead of using the base 10. Example Description The following formulas return the same result, 2: Code =LOG(100,10) =LOG(100) =LOG10(100) See Also Scalar math and trig functions EXP LOG10 LOG MOD Function Returns the remainder after a number is divided by a divisor. The result always has the same sign as the divisor. Syntax MOD(<number>, <divisor>) Parameters Term Definition number The number for which you want to find the remainder after the division is performed. divisor The number by which you want to divide. 201 Return Value A whole number. Remarks If the divisor is 0 (zero), MOD returns an error. You cannot divide by 0. The MOD function can be expressed in terms of the INT function: Example Description The following formula returns 1, the remainder of 3 divided by 2. Code =MOD(3,2) Example Description The following formula returns -1, the remainder of 3 divided by 2. Note that the sign is always the same as the sign of the divisor. Code =MOD(-3,-2) See Also math and trig functions ROUND ROUNDUP ROUNDDOWN MROUND INT MROUND Function Returns a number rounded to the desired multiple. Syntax MROUND(<number>, <multiple>) Parameters Term Definition number The number to round. multiple The multiple of significance to which you 202 Term Definition want to round the number. Return Value A decimal number. Remarks MROUND rounds up, away from zero, if the remainder of dividing number by the specified multiple is greater than or equal to half the value of multiple. Example: Decimal Places Description The following expression rounds 1.3 to the nearest multiple of .2. The expected result is 1.4. Code =MROUND(-1.3,0.2) Example: Negative Numbers Description The following expression rounds -10 to the nearest multiple of -3. The expected result is -9. Code =MROUND(-10,-3) Example: Error Description The following expression returns an error, because the numbers have different signs. Code =MROUND(5,-2) See Also math and trig functions ROUND ROUNDUP ROUNDDOWN MROUND INT PI Function Returns the value of Pi, 3.14159265358979, accurate to 15 digits. 203 Syntax PI() Return Value A decimal number with the value of Pi, 3.14159265358979, accurate to 15 digits. Remarks Pi is a mathematical constant. In DAX, Pi is represented as a real number accurate to 15 digits, the same as Excel. Example Description The following formula calculates the area of a circle given the radius in the column, [Radius]. Code =PI()*([Radius]*2) See Also math and trig functions POWER Function Returns the result of a number raised to a power. Syntax POWER(<number>, <power>) Parameters Term Definition number The base number, which can be any real number. power The exponent to which the base number is raised. Return Value A decimal number. Example Description The following example returns 25. 204 Code =POWER(5,2) See Also Scalar math and trig functions QUOTIENT Function Performs division and returns only the integer portion of the division result. Use this function when you want to discard the remainder of division. Syntax QUOTIENT(<numerator>, <denominator>) Parameters Term Definition numerator The dividend, or number to divide. denominator The divisor, or number to divide by. Return Value A whole number. Remarks If either argument is non-numeric, QUOTIENT returns the #VALUE! error value. You can use a column reference instead of a literal value for either argument. However, if the column that you reference contains a 0 (zero), an error is returned for the entire column of values. Example Description The following formulas return the same result, 2. Code =QUOTIENT(5,2) =QUOTIENT(10/2,2) See Also Scalar math and trig functions 205 RAND Function Returns a random number greater than or equal to 0 and less than 1, evenly distributed. The number that is returned changes each time the cell containing this function is recalculated. Syntax RAND() Return Value A decimal number. Remarks In PowerPivot workbooks, recalculation depends on various factors, including whether the workbook is set to Manual or Automatic recalculation mode, and whether data has been refreshed. This is different from Microsoft Excel, where you can control when RAND generates a new random number by turning off recalculation. For more information, see Data Refresh and Recalculation. RAND and other volatile functions that do not have fixed values are not always recalculated. For example, execution of a query or filtering will usually not cause such functions to be re-evaluated. However, the results for these functions will be recalculated when the entire column is recalculated. These situations include refresh from an external data source or manual editing of data that causes re-evaluation of formulas that contain these functions. Moreover, RAND is always recalculated if the function is used in the definition of a measure. Also, in such contexts the RAND function cannot return a result of zero, to prevent errors such as division by zero. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description To generate a random real number between two other numbers, you can use a formula like the following: Code = RAND()*(int1-int2)+int1 See Also Scalar math and trig functions Relational math and trig functions 206 RANDBETWEEN Function Returns a random number in the range between two numbers you specify. Syntax RANDBETWEEN(<bottom>,<top>) Parameters Term Definition Bottom The smallest integer the function will return. Top The largest integer the function will return. Return Value A whole number. Remarks This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following formula returns a random number between 1 and 10. Code =RANDBETWEEN(1,10) See Also Scalar math and trig functions Relational math and trig functions ROUND Function Rounds a number to the specified number of digits. Syntax ROUND(<number>, <num_digits>) Parameters 207 Term Definition number The number you want to round. num_digits The number of digits to which you want to round. A negative value rounds digits to the left of the decimal point; a value of zero rounds to the nearest integer. Return Value A decimal number. Remarks If num_digits is greater than 0 (zero), then number is rounded to the specified number of decimal places. If num_digits is 0, the number is rounded to the nearest integer. If num_digits is less than 0, the number is rounded to the left of the decimal point. Related Functions To always round up (away from zero), use the ROUNDUP function. To always round down (toward zero), use the ROUNDDOWN function. To round a number to a specific multiple (for example, to round to the nearest multiple of 0.5), use the MROUND function. You can use the functions TRUNC and INT to obtain the integer portion of the number. Example Description The following formula rounds 2.15 up, to one decimal place. The expected result is 2.2. Code =ROUND(2.15,1) Example Description The following formula rounds 21.5 to one decimal place to the left of the decimal point. The expected result is 20. Code =ROUND(21.5,-1) See Also Math and Trig functions ROUND ROUNDDOWN 208 MROUND INT TRUNC ROUNDDOWN Function Rounds a number down, toward zero. Syntax ROUNDDOWN(<number>, <num_digits>) Parameters Term Definition number A real number that you want rounded down. num_digits The number of digits to which you want to round. Negative rounds to the left of the decimal point; zero to the nearest integer. Return Value A decimal number. Remarks If num_digits is greater than 0 (zero), then the value in number is rounded down to the specified number of decimal places. If num_digits is 0, then the value in number is rounded down to the nearest integer. If num_digits is less than 0, then the value in number is rounded down to the left of the decimal point. Related Functions ROUNDDOWN behaves like ROUND, except that it always rounds a number down. The INT function also rounds down, but with INT the result is always an integer, whereas with ROUNDDOWN you can control the precision of the result. Example Description The following example rounds 3.14159 down to three decimal places. The expected result is 3.141. Code =ROUNDDOWN(3.14159,3) 209 Example Description The following example rounds the value of 31415.92654 down to 2 decimal places to the left of the decimal. The expected result is 31400. Code =ROUNDDOWN(31415.92654, -2) See Also Math and Trig functions ROUND ROUNDUP ROUNDDOWN MROUND INT ROUNDUP Function Rounds a number up, away from 0 (zero). Syntax ROUNDUP(<number>, <num_digits>) Parameters Term Definition number A real number that you want to round up. num_digits The number of digits to which you want to round. A negative value for num_digits rounds to the left of the decimal point; if num_digits is zero or is omitted, number is rounded to the nearest integer. Return Value A decimal number. Remarks ROUNDUP behaves like ROUND, except that it always rounds a number up. • If num_digits is greater than 0 (zero), then the number is rounded up to the specified number of decimal places. 210 • If num_digits is 0, then number is rounded up to the nearest integer. • If num_digits is less than 0, then number is rounded up to the left of the decimal point. Related Functions ROUNDUP behaves like ROUND, except that it always rounds a number up. Example Description The following formula rounds Pi to four decimal places. The expected result is 3.1416. Code =ROUNDUP(PI(),4) Example: Decimals as Second Argument Description The following formula rounds 1.3 to the nearest multiple of 0.2. The expected result is 1.4. Code =ROUNDUP(1.3,0.2) Example: Negative Number as Second Argument Description The following formula rounds the value in the column, FreightCost, with the expected results shown in the following table: Code =ROUNDUP([Values],-1) Comments When num_digits is less than zero, the number of places to the left of the decimal sign is increased by the value you specify. FreightCost Expected Result 13.25 20 2.45 10 25.56 30 1.34 10 345.01 350 See Also 211 math and trig functions ROUND ROUNDDOWN MROUND INT SIGN Function Determines the sign of a number, the result of a calculation, or a value in a column. The function returns 1 if the number is positive, 0 (zero) if the number is zero, or -1 if the number is negative. Syntax SIGN(<number>) Parameters Term Definition number Any real number, a column that contains numbers, or an expression that evaluates to a number. Return Value A whole number. The possible return values are 1, 0, and -1. Return Value Description 1 The number is positive 0 The number is zero -1 The number is negative Example Description The following formula returns the sign of the result of the expression that calculates sale price minus cost. Code =SIGN( ([Sale Price] - [Cost]) ) 212 See Also math and trig functions SQRT Function Returns the square root of a number. Syntax SQRT(<number>) Parameters Term Definition number The number for which you want the square root, a column that contains numbers, or an expression that evaluates to a number. Return Value A decimal number. Remarks If the number is negative, the SQRT function returns an error. Example Description The following formula returns 5. Code =SQRT(25) See Also Scalar math and trig functions SUM Function Adds all the numbers in a column. Syntax SUM(<column>) Parameters 213 Term Definition column The column that contains the numbers to sum. Return Value A decimal number. Remarks If any rows contain non-numeric values, blanks are returned. If you want to filter the values that you are summing, you can use the SUMX function and specify an expression to sum over. Example Description The following example adds all the numbers that are contained in the column, Amt, from the table, Sales. Code =SUM(Sales[Amt]) See Also SUMX Aggregation functions SUMX Function Returns the sum of an expression evaluated for each row in a table. Syntax SUMX(<table>, <expression>) Parameters Term Definition table The table containing the rows for which the expression will be evaluated. expression The expression to be evaluated for each row of the table. Return Value 214 A decimal number. Remarks The SUMX function takes as its first argument a table, or an expression that returns a table. The second argument is a column that contains the numbers you want to sum, or an expression that evaluates to a column. Only the numbers in the column are counted. Blanks, logical values, and text are ignored. To see some more complex examples of SUMX in formulas, see ALL and CALCULATETABLE. Example Description The following example first filters the table, InternetSales, on the expression, ShippingTerritoryID = 5, and then returns the sum of all values in the column, Freight. In other words, the expression returns the sum of freight charges for only the specified sales area. Code =SUMX(FILTER(InternetSales, InternetSales[SalesTerritoryID]=5),[Freight]) Comments If you do not need to filter the column, use the SUM function. The SUM function is similar to the Excel function of the same name, except that it takes a column as a reference. See Also SUM Aggregation functions TRUNC Function Truncates a number to an integer by removing the decimal, or fractional, part of the number. Syntax TRUNC(<number>,<num_digits>) Parameters Term Definition number The number you want to truncate. num_digits A number specifying the precision of the 215 Term Definition truncation; if omitted, 0 (zero) Return Value A whole number. Remarks TRUNC and INT are similar in that both return integers. TRUNC removes the fractional part of the number. INT rounds numbers down to the nearest integer based on the value of the fractional part of the number. INT and TRUNC are different only when using negative numbers: TRUNC(-4.3) returns -4, but INT(-4.3) returns -5 because -5 is the smaller number. Example Description The following formula returns 3, the integer part of pi. Code =TRUNC(PI()) Example Description The following formula returns -8, the integer part of -8.9. Code =TRUNC(-8.9) See Also math and trig functions ROUND ROUNDUP ROUNDDOWN MROUND INT Statistical Functions Data Analysis Expressions (DAX) provides many functions for creating aggregations such as sums, counts, and averages. These functions are very similar to aggregation functions used by Microsoft Excel. This section lists the statistical and aggregation functions provided in DAX. In this Section 216 ADDCOLUMNS AVERAGE AVERAGEA AVERAGEX COUNT COUNTA COUNTAX COUNTBLANK COUNTROWS COUNTX CROSSJOIN DISTINCTCOUNT GENERATE GENERATEALL MAX MAXA MAXX MINA MIN MINX RANK.EQ RANKX ROW STDEV.P STDEV.S STDEVX.P STDEVX.S SUMMARIZE TOPN VAR.P VAR.S VARX.P VARX.S Reference Using DAX 217 Basic DAX Syntax Related Sections Date and Time Functions (DAX) Aggregation Functions (DAX) Logical Functions (DAX) Filter and Value Functions (DAX) Math and Trigonometric Functions (DAX) See Also Getting Started with Data Analysis Expressions (DAX) ADDCOLUMNS Function Adds calculated columns to the given table or table expression. Syntax ADDCOLUMNS(<table>, <name>, <expression>[, <name>, <expression>]…) Parameters Parameter Description table Any DAX expression that returns a table of data. name The name given to the column, enclosed in double quotes. expression Any DAX expression that returns a scalar expression, evaluated for each row of table. Return Value A table with all its original columns and the added ones. Remarks Example Description The following example returns an extended version of the Product Category table that includes total sales values from the reseller channel and the internet sales. Code ADDCOLUMNS(ProductCategory, 218 , "Internet Sales", SUMX(RELATEDTABLE(InternetSales_USD), InternetSales_USD[SalesAmount_USD]) , "Reseller Sales", SUMX(RELATEDTABLE(ResellerSales_USD), ResellerSales_USD[SalesAmount_USD])) Comments The following table shows a preview of the data as it would be received by any function expecting to receive a table: ProductCategory[Pr ProductCategory[Produ ProductCategory[P [Inter [Rese oductCategoryName ctCategoryAlternateKey roductCategoryKey net ller ] Sales] Sales] ] ] Bikes 1 1 25107 63084 749.7 675.0 7 4 Components 2 2 11205 837.9 6 Clothing 3 3 30615 16699 7.582 43.26 9 7 Accessories 4 4 64092 53430 0.133 1.988 8 8 AVERAGE Function Returns the average (arithmetic mean) of all the numbers in a column. Syntax AVERAGE(<column>) Parameters 219 Term Definition column The column that contains the numbers for which you want the average. Return Value Returns a decimal number that represents the arithmetic mean of the numbers in the column. Remarks This function takes the specified column as an argument and finds the average of the values in that column. If you want to find the average of an expression that evaluates to a set of numbers, use the AVERAGEX function instead. Nonnumeric values in the column are handled as follows: • If the column contains text, no aggregation can be performed, and the functions returns blanks. • If the column contains logical values or empty cells, those values are ignored. • Cells with the value zero are included. • When you average cells, you must keep in mind the difference between an empty cell and a cell that contains the value 0 (zero). When a cell contains 0, it is added to the sum of numbers and the row is counted among the number of rows used as the divisor. However, when a cell contains a blank, the row is not counted. Whenever there are no rows to aggregate, the function returns a blank. However, if there are rows, but none of them meet the specified criteria, the function returns 0. Excel also returns a zero if no rows are found that meet the conditions. Example Description The following formula returns the average of the values in the column, ExtendedSalesAmount, in the table, InternetSales. Code =AVERAGE(InternetSales[ExtendedSalesAmount]) Related Functions The AVERAGEX function can take as its argument an expression that is evaluated for each row in a table. This enables you to perform calculations and then take the average of the calculated values. The AVERAGEA function takes a column as its argument, but otherwise is like the Excel function of the same name. By using the AVERAGEA function, you can calculate a mean on a column that contains empty values. See Also 220 AVERAGEA AVERAGEX Aggregation functions AVERAGEA Function Returns the average (arithmetic mean) of the values in a column. Handles text and nonnumeric values. Syntax AVERAGEA(<column>) Parameters Term Definition column A column that contains the values for which you want the average. Return Value A decimal number. Remarks The AVERAGEA function takes a column and averages the numbers in it, but also handles non-numeric data types according to the following rules: • Values that evaluates to TRUE count as 1. • Values that evaluate to FALSE count as 0 (zero). • Values that contain non-numeric text count as 0 (zero). • Empty text ("") counts as 0 (zero). If you do not want to include logical values and text representations of numbers in a reference as part of the calculation, use the AVERAGE function. Whenever there are no rows to aggregate, the function returns a blank. However, if there are rows, but none of them meet the specified criteria, the function returns 0. Microsoft Excel also returns a zero if no rows are found that meet the conditions. Example Description The following example returns the average of non-blank cells in the referenced column, given the following table. If you used the AVERAGE function, the mean would be 21/2; with the AVERAGEA function, the result is 22/5. 221 Transaction ID Amount Result 0000123 1 Counts as 1 0000124 20 Counts as 20 0000125 n/a Counts as 0 0000126 0000126 Counts as 0 TRUE Counts as 1 Code =AVERAGEA([Amount]) See Also AVERAGE AVERAGEX Aggregation functions AVERAGEX Function Calculates the average (arithmetic mean) of a set of expressions evaluated over a table. Syntax AVERAGEX(<table>,<expression>) Parameters Term Definition table Name of a table, or an expression that specifies the table over which the aggregation can be performed. expression An expression with a scalar result, which will be evaluated for each row of the table in the first argument. Return Value A decimal number. Remarks 222 The AVERAGEX function enables you to evaluate expressions for each row of a table, and then take the resulting set of values and calculate its arithmetic mean. Therefore, the function takes a table as its first argument, and an expression as the second argument. In all other respects, AVERAGEX follows the same rules as AVERAGE. You cannot include non-numeric or null cells. Both the table and expression arguments are required. When there are no rows to aggregate, the function returns a blank. When there are rows, but none of them meet the specified criteria, then the function returns 0. Example Description The following example calculates the average freight and tax on each order in the InternetSales table, by first summing Freight plus TaxAmt in each row, and then averaging those sums. Code =AVERAGEX(InternetSales, InternetSales[Freight]+ InternetSales[TaxAmt]) Comments If you use multiple operations in the expression used as the second argument, you must use parentheses to control the order of calculations. For more information, see Basic DAX Syntax. See Also AVERAGE AVERAGEA Aggregation functions COUNT Function The COUNT function counts the number of cells in a column that contain numbers. Syntax COUNT(<column>) Parameters Term Definition column The column that contains the numbers to be counted Return Value A whole number. 223 Remarks The only argument allowed to this function is a column. You can use columns containing any type of data, but only numbers are counted. The COUNT function counts rows that contain the following kinds of values: • Numbers • Dates If the row contains text that cannot be translated into a number, the row is not counted. When the function finds no rows to count, it returns a blank. When there are rows, but none of them meet the specified criteria, then the function returns 0. Example Description The following example shows how to count the number of numeric values in the column, ShipDate. Code =COUNT([ShipDate]) Comments To count logical values or text, use the COUNTA or COUNTAX functions. See Also COUNT COUNTA COUNTAX COUNTX Aggregation functions COUNTA Function The COUNTA function counts the number of cells in a column that are not empty. It counts not just rows that contain numeric values, but also rows that contain nonblank values, including text, dates, and logical values. Syntax COUNTA(<column>) Parameters Term Definition column The column that contains the values to be counted 224 Return Value A whole number. Remarks If you do not need to count cells that contain logical values or text (in other words, if you want to count only cells that contain numbers), use the COUNT or COUNTX functions. When the function does not find any rows to count, the function returns a blank. When there are rows, but none of them meet the specified criteria, then the function returns 0. Example Description The following example returns all rows in the Reseller table that have any kind of value in the column that stores phone numbers. Because the table name does not contain any spaces, the quotation marks are optional. Code =COUNTA('Reseller'[Phone]) See Also COUNT COUNTA COUNTAX COUNTX Aggregation functions COUNTAX Function The COUNTAX function counts nonblank results when evaluating the result of an expression over a table. That is, it works just like the COUNTA function, but is used to iterate through the rows in a table and count rows where the specified expressions results in a nonblank result. Syntax COUNTAX(<table>,<expression>) Parameters Term Definition table The table containing the rows for which the expression will be evaluated. expression The expression to be evaluated for each 225 Term Definition row of the table. Return Value A whole number. Remarks Like the COUNTA function, the COUNTAX function counts cells containing any type of information, including other expressions. For example, if the column contains an expression that evaluates to an empty string, the COUNTAX function treats that result as nonblank. Usually the COUNTAX function does not count empty cells but in this case the cell contains a formula, so it is counted. If you do not need to count logical values or text, use the COUNTX function instead. Whenever the function finds no rows to aggregate, the function returns a blank. However, if there are rows, but none of them meet the specified criteria, the function returns 0. Microsoft Excel also returns 0 if no rows are found that meet the condition. Example Description The following example counts the number of nonblank rows in the column, Phone, using the table that results from filtering the Reseller table on [Status] = Active. Code =COUNTAX(FILTER('Reseller',[Status]="Active"),[Phone]) See Also COUNT COUNTA COUNTAX COUNTX Aggregation functions COUNTBLANK Function Counts the number of blank cells in a column. Syntax COUNTBLANK(<column>) Parameters 226 Term Definition column The column that contains the blank cells to be counted. Return Value A whole number. If no rows are found that meet the condition, blanks are returned. Remarks The only argument allowed to this function is a column. You can use columns containing any type of data, but only blank cells are counted. Cells that have the value zero (0) are not counted, as zero is considered a numeric value and not a blank. Whenever there are no rows to aggregate, the function returns a blank. However, if there are rows, but none of them meet the specified criteria, the function returns 0. Microsoft Excel also returns a zero if no rows are found that meet the conditions. In other words, if the COUNTBLANK function finds no blanks, the result will be zero, but if there are no rows to check, the result will be blank. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following example shows how to count the number of rows in the table Reseller that have blank values for BankName. Code =COUNTBLANK(Reseller[BankName]) Comments To count logical values or text, use the COUNTA or COUNTAX functions. See Also COUNT COUNTA COUNTAX COUNTX Aggregation functions COUNTROWS Function The COUNTROWS function counts the number of rows in the specified table, or in a table defined by an expression. 227 Syntax COUNTROWS(<table>) Parameters Term Definition table The name of the table that contains the rows to be counted, or an expression that returns a table. Return Value A whole number. Remarks This function can be used to count the number of rows in a base table, but more often is used to count the number of rows that result from filtering a table, or applying context to a table. Whenever there are no rows to aggregate, the function returns a blank. However, if there are rows, but none of them meet the specified criteria, the function returns 0. Microsoft Excel also returns a zero if no rows are found that meet the conditions. Example Description The following example shows how to count the number of rows in the table Orders. The expected result is 52761. Code =COUNTROWS('Orders') Example Description The following example demonstrates how to use COUNTROWS with a row context. In this scenario, there are two sets of data that are related by order number. The table Reseller contains one row for each reseller; the table ResellerSales contains multiple rows for each order, each row containing one order for a particular reseller. The tables are connected by a relationship on the column, ResellerKey. The formula gets the value of ResellerKey and then counts the number of rows in the related table that have the same reseller ID. The result is output in the column, CalculatedColumn1. Code =COUNTROWS(RELATEDTABLE(ResellerSales)) 228 Comments The following table shows a portion of the expected results: ResellerKey CalculatedColumn1 1 73 2 70 3 394 See Also COUNT COUNTA COUNTAX COUNTX Aggregation functions COUNTX Function Counts the number of rows that contain a number or an expression that evaluates to a number, when evaluating an expression over a table. Syntax COUNTX(<table>,<expression>) Parameters Term Definition table The table containing the rows to be counted. expression An expression that returns the set of values that contains the values you want to count. Return Value An integer. Remarks 229 The COUNTX function takes two arguments. The first argument must always be a table, or any expression that returns a table. The second argument is the column or expression that is searched by COUNTX. The COUNTX function counts only numeric values, or dates. Arguments that are logical values or text that cannot be translated into numbers are not counted. If the function finds no rows to count, it returns a blank. When there are rows, but none meets the specified criteria, then the function returns 0. If you want to count logical values, or text, use the COUNTA or COUNTAX functions. Example Description The following formula returns a count of all rows in the Product table that have a list price. Code =COUNTX(Product,[ListPrice]) Example Description The following formula illustrates how to pass a filtered table to COUNTX for the first argument. The formula uses a filter expression to get only the rows in the Product table that meet the condition, ProductSubCategory = "Caps", and then counts the rows in the resulting table that have a list price. The FILTER expression applies to the table Products but uses a value that you look up in the related table, ProductSubCategory. Code =COUNTX(FILTER(Product,RELATED(ProductSubcategory[EnglishProductSubcate goryName])="Caps", Product[ListPrice]) See Also COUNT COUNTA COUNTAX COUNTX Aggregation functions CROSSJOIN Function Returns a table that contains the Cartesian product of all rows from all tables in the arguments. The columns in the new table are all the columns in all the argument tables. Syntax CROSSJOIN(<table>, <table>[, <table>]…) Parameters 230 Parameter Description Any DAX expression that returns a table of data Return Value A table that contains the Cartesian product of all rows from all tables in the arguments. Remarks • Column names from table arguments must all be different in all tables or an error is returned. • The total number of rows returned by CROSSJOIN() is equal to the product of the number of rows from all tables in the arguments; also, the total number of columns in the result table is the sum of the number of columns in all tables. For example, if TableA has rA rows and cA columns, and TableB has rB rows and cB columns, and TableC has rC rows and cC column; then, the resulting table has rA × rb × rC rows and cA + cB + cC columns. Example Description The following example shows the results of applying CROSSJOIN() to two tables: Colors and Stationery. The table Colors contains colors and patterns: Color Pattern Red Horizontal Stripe Green Vertical Stripe Blue Crosshatch The table Stationery contains fonts and presentation: Font Presentation serif embossed sans-serif engraved The expression to generate the cross join is presented below: 231 Code CROSSJOIN( Colors, Stationery) Comments When the above expression is used wherever a table expression is expected, the results of the expression would be as follows: Red Horizontal Stripe serif embossed Green Vertical Stripe serif embossed Blue Crosshatch serif embossed Red Horizontal Stripe sans-serif engraved Green Vertical Stripe sans-serif engraved Blue Crosshatch sans-serif engraved DISTINCTCOUNT Function The DISTINCTCOUNT function counts the number of different cells in a column of numbers. Syntax DISTINCTCOUNT(<column>) Parameters Parameter Description The column that contains the numbers to be counted Return Value The number of distinct values in column. Remarks The only argument allowed to this function is a column. You can use columns containing any type of data. When the function finds no rows to count, it returns a BLANK, otherwise it returns the count of distinct values. Example Description 232 The following example shows how to count the number of distinct sales orders in the column ResellerSales_USD[SalesOrderNumber]. Code =DISTINCTCOUNT(ResellerSales_USD[SalesOrderNumber]) Comments Using the above measure in a table with calendar year in the side and product category on top gives the following results: Distinct Reseller Orders count Column Labels Row Labels Accessories Bikes Clothing Components Grand Total 2005 135 345 242 205 366 2006 356 850 644 702 1015 2007 531 1234 963 1138 1521 2008 293 724 561 601 894 Grand Total 1315 3153 2410 2646 1 1 1 3797 In the above example the user should be able to note that the rows Grand Total numbers do not add up, this happens because the same order might contain line items, in the same order, from different product categories. See Also COUNT COUNTA COUNTAX COUNTX Aggregation functions GENERATE Function Returns a table with the Cartesian product between each row in table1 and the table that results from evaluating table2 in the context of the current row from table1. 233 Syntax GENERATE(<table1>, <table2>) Parameters Parameter Description Any DAX expression that returns a table. Any DAX expression that returns a table. Return Value A table with the Cartesian product between each row in table1 and the table that results from evaluating table2 in the context of the current row from table1 Remarks • If the evaluation of table2 for the current row in table1 returns an empty table, then the result table will not contain the current row from table1. This is different than GENERATEALL() where the current row from table1 will be included in the results and columns corresponding to table2 will have null values for that row. • All column names from table1 and table2 must be different or an error is returned. Example Description In the following example the user wants a summary table of the sales by Region and Product Category for the Resellers channel, like the following table: SalesTerritory[SalesTerritoryGrou ProductCategory[ProductCategoryNam [Reseller p] e] Sales] Europe Accessories $ 142,227.27 Europe Bikes $ 9,970,200.44 Europe Clothing $ 365,847.63 Europe Components $ 2,214,440.19 North America Accessories $ 234 379,305.15 North America Bikes $ 52,403,796.8 5 North America Clothing $ 1,281,193.26 North America Components $ 8,882,848.05 Pacific Accessories $ 12,769.57 Pacific Bikes $ 710,677.75 Pacific Clothing $ 22,902.38 Pacific Components $ 108,549.71 The following code produces the above table: Code GENERATE( SUMMARIZE(SalesTerritory, SalesTerritory[SalesTerritoryGroup]) ,SUMMARIZE(ProductCategory , [ProductCategoryName] , "Reseller Sales", SUMX(RELATEDTABLE(ResellerSales_USD), ResellerSales_USD[SalesAmount_USD]) ) ) Comments 1. The first SUMMARIZE statement, SUMMARIZE(SalesTerritory, SalesTerritory[SalesTerritoryGroup]), produces a table of territory groups, where each row is a territory group, as shown below: 235 SalesTerritory[SalesTerritoryGroup] North America Europe Pacific NA 2. The second SUMMARIZE statement, SUMMARIZE(ProductCategory, [ProductCategoryName], "Reseller Sales", SUMX(RELATEDTABLE(ResellerSales_USD), ResellerSales_USD[SalesAmount_USD])), produces a table of Product Category groups with the Reseller sales for each group, as shown below: ProductCategory[ProductCategoryName] [Reseller Sales] Bikes $ 63,084,675.04 Components $ 11,205,837.96 Clothing $ 1,669,943.27 Accessories $ 534,301.99 3. However, when you take the above table and evaluate it under the context of each row from the territory groups table, you obtain different results for each territory. GENERATEALL Function Returns a table with the Cartesian product between each row in table1 and the table that results from evaluating table2 in the context of the current row from table1. Syntax GENERATEALL(<table1>, <table2>) Parameters Parameter Description Any DAX expression that returns a table. Any DAX expression that returns a table. 236 Return Value A table with the Cartesian product between each row in table1 and the table that results from evaluating table2 in the context of the current row from table1 Remarks • If the evaluation of table2 for the current row in table1 returns an empty table, then the current row from table1 will be included in the results and columns corresponding to table2 will have null values for that row. This is different than GENERATE() where the current row from table1 will not be included in the results. • All column names from table1 and table2 must be different or an error is returned. Example Description In the following example, the user wants a summary table of the sales by Region and Product Category for the Resellers channel, like the following table: SalesTerritory[SalesTerritoryGroup] ProductCategory[ProductCategoryName] [Reseller Sales] Europe Accessories $ 142,227.27 Europe Bikes $ 9,970,200.44 Europe Clothing $ 365,847.63 Europe Components $ 2,214,440.19 NA Accessories NA Bikes NA Clothing NA Components North America Accessories $ 379,305.15 North America Bikes $ 52,403,796.85 North America Clothing $ 1,281,193.26 237 SalesTerritory[SalesTerritoryGroup] ProductCategory[ProductCategoryName] [Reseller Sales] North America Components $ 8,882,848.05 Pacific Accessories $ 12,769.57 Pacific Bikes $ 710,677.75 Pacific Clothing $ 22,902.38 Pacific Components $ 108,549.71 The following code produces the above table: Code GENERATEALL( SUMMARIZE(SalesTerritory, SalesTerritory[SalesTerritoryGroup]) ,SUMMARIZE(ProductCategory , [ProductCategoryName] , "Reseller Sales", SUMX(RELATEDTABLE(ResellerSales_USD), ResellerSales_USD[SalesAmount_USD]) ) ) Comments 1. The first SUMMARIZE produces a table of territory groups, where each row is a territory group, like those listed below: SalesTerritory[SalesTerritoryGroup] North America Europe Pacific NA 238 2. The second SUMMARIZE produces a table of Product Category groups with the Reseller sales for each group, as shown below: ProductCategory[ProductCategoryName] [Reseller Sales] Bikes $ 63,084,675.04 Components $ 11,205,837.96 Clothing $ 1,669,943.27 Accessories $ 534,301.99 3. However, when you take the above table and evaluate the table under the context of each row from the territory groups table, you obtain different results for each territory. MAX Function Returns the largest numeric value in a column. Syntax MAX(<column>) Parameters Term Definition column The column in which you want to find the largest numeric value. Property Value/Return Value A decimal number. Remarks The MAX function takes as an argument a column that contains numeric values. If the column contains no numbers, MAX returns a blank. If you want to evaluate values that are not numbers, use the MAXA function. Example Description The following example returns the largest value found in the ExtendedAmount column of the InternetSales table. 239 Code =MAX(InternetSales[ExtendedAmount]) See Also MAX MAXA MAXX Aggregation functions MAXA Function Returns the largest value in a column. Logical values and blanks are counted. Syntax MAXA(<column>) Parameters Term Definition column The column in which you want to find the largest value. Return Value A decimal number. Remarks The MAXA function takes as argument a column, and looks for the largest value among the following types of values: • Numbers • Dates • Logical values, such as TRUE and FALSE. Rows that evaluate to TRUE count as 1; rows that evaluate to FALSE count as 0 (zero). Empty cells are ignored. If the column contains no values that can be used, MAXA returns 0 (zero). If you do not want to include logical values and blanks as part of the calculation, use the MAX function. Example Description 240 The following example returns the greatest value from a calculated column, named ResellerMargin, that computes the difference between list price and reseller price. Code =MAXA([ResellerMargin]) Example Description The following example returns the largest value from a column that contains dates and times. Therefore, this formula gets the most recent transaction date. Code =MAXA([TransactionDate]) See Also MAX MAXA MAXX Aggregation functions MAXX Function Evaluates an expression for each row of a table and returns the largest numeric value. Syntax MAXX(<table>,<expression>) Parameters Term Definition table The table containing the rows for which the expression will be evaluated. expression The expression to be evaluated for each row of the table. Return Value A decimal number. Remarks The table argument to the MAXX function can be a table name, or an expression that evaluates to a table. The second argument indicates the expression to be evaluated for each row of the table. 241 Of the values to evaluate, only the following are counted: • Numbers. If the expression does not evaluate to a number, MAXX returns 0 (zero). • Dates. Empty cells, logical values, and text values are ignored. If you want to include nonnumeric values in the formula, use the MAXA function. If a blank cell is included in the column or expression, MAXX returns an empty column. Example Description The following formula uses an expression as the second argument to calculate the total amount of taxes and shipping for each order in the table, InternetSales. The expected result is 375.7184. Code =MAXX(InternetSales, InternetSales[TaxAmt]+ InternetSales[Freight]) Example Description The following formula first filters the table InternetSales, by using a FILTER expression, to return a subset of orders for a specific sales region, defined as [SalesTerritory] = 5. The MAXX function then evaluates the expression used as the second argument for each row of the filtered table, and returns the highest amount for taxes and shipping for just those orders. The expected result is 250.3724. Code =MAXX(FILTER(InternetSales,[SalesTerritoryCode]="5"), InternetSales[TaxAmt]+ InternetSales[Freight]) See Also MAX MAXA MAXX Aggregation functions MIN Function Returns the smallest numeric value in a column. Ignores logical values and text. Syntax MIN(<column>) Parameters 242 Term Definition column The column in which you want to find the smallest numeric value. Return Value A decimal number. Remarks The MIN function takes a column as an argument, and returns the smallest numeric value in the column. The following types of values in the columns are counted: • Numbers • Dates • If the column contains no numerical data, MIN returns blanks. Empty cells, logical values, and text are ignored. If you want to include logical values and text representations of numbers in a reference as part of the calculation, use the MINA function. Example Description The following example returns the smallest value from the calculated column, ResellerMargin. Code =MIN([ResellerMargin]) Example Description The following example returns the smallest value from a column that contains dates and times, TransactionDate. This formula therefore returns the date that is earliest. Code =MIN([TransactionDate]) See Also MIN MINA MINX Aggregation functions MINA Function Returns the smallest value in a column, including any logical values and numbers represented as text. 243 Syntax MINA(<column>) Parameters Term Definition column The column for which you want to find the minimum value. Return Value A decimal number. Remarks The MINA function takes as argument a column that contains numbers, and determines the smallest value as follows: • If the column contains no numeric values, MINA returns 0 (zero). • Rows in the column that evaluates to logical values, such as TRUE and FALSE are treated as 1 if TRUE and 0 (zero) if FALSE. • Empty cells are ignored. If you do not want to include logical values and text as part of the calculation, use the MIN function instead. Example Description The following expression returns the minimum freight charge from the table, InternetSales. Code =MINA(InternetSales[Freight]) Example Description The following expression returns the minimum value in the column, PostalCode. Because the data type of the column is text, the function does not find any numeric values, and the formula returns zero (0). Code =MINA([PostalCode]) See Also MIN MINA 244 MINX Aggregation functions MINX Function Returns the smallest numeric value that results from evaluating an expression for each row of a table. Syntax MINX(<table>, < expression>) Parameters Term Definition table The table containing the rows for which the expression will be evaluated. expression The expression to be evaluated for each row of the table. Return Value A decimal number. Remarks The MINX function takes as its first argument a table, or an expression that returns a table. The second argument contains the expression that is evaluated for each row of the table. The MINX function evaluates the results of the expression in the second argument according to the following rules: • Only numbers are counted. If the expression does not result in a number, MINX returns 0 (zero). • Empty cells, logical values, and text values are ignored. Numbers represented as text are treated as text. If you want to include logical values and text representations of numbers in a reference as part of the calculation, use the MINA function. Example Description The following example filters the table, InternetSales, and returns only rows for a specific sales territory. The formula then finds the minimum value in the column, Freight. Code 245 =MINX( FILTER(InternetSales, [SalesTerritoryKey] = 5),[Freight]) Example Description The following example uses the same filtered table as in the previous example, but instead of merely looking up values in the column for each row of the filtered table, the function calculates the sum of two columns, Freight and TaxAmt, and returns the smallest value resulting from that calculation. Code =MINX( FILTER(InternetSales, InternetSales[SalesTerritoryKey] = 5), InternetSales[Freight] + InternetSales[TaxAmt]) Comments In the first example, the names of the columns are unqualified. In the second example, the column names are fully qualified. See Also MIN MINA MINX Aggregation functions RANK.EQ Function Returns the ranking of a number in a list of numbers. Syntax RANK.EQ(<value>, <columnName>[, <order>]) Parameters Parameter Description Any DAX expression that returns a single scalar value whose rank is to be found. The expression is to be evaluated exactly once, before the function is evaluated, and it’s value passed to the argument list. The name of an existing column against which ranks will be determined. It cannot be an expression or a column created using these functions: 246 ADDCOLUMNS, ROW or SUMMARIZE. (Optional) A value that specifies how to rank number, low to high or high to low: value alternate value Description 0 (zero) FALSE Ranks in descending order of columnName. If value is equal to the highest number in columnName then RANK.EQ is 1. 1 TRUE Ranks in ascending order of columnName. If value is equal to the lowest number in columnName then RANK.EQ is 1. Return Value A number indicating the rank of value among the numbers in columnName. Exceptions Remarks • columnName cannot refer to any column created using these functions: ADDCOLUMNS, ROW or SUMMARIZE.I • If value is not in columnName or value is a blank, then RANK.EQ returns a blank value. 247 • Duplicate values of value receive the same rank value; the next rank value assigned will be the rank value plus the number of duplicate values. For example if five (5) values are tied with a rank of 11 then the next value will receive a rank of 16 (11 + 5). Example Description The following example creates a calculated column that ranks the values in SalesAmount_USD, from the InternetSales_USD table, against all numbers in the same column. Code =RANK.EQ(InternetSales_USD[SalesAmount_USD], InternetSales_USD[SalesAmount_USD]) Comments Example Description The following example ranks a subset of values against a given sample. Assume that you have a table of local students with their performance in a specific national test and, also, you have the entire set of scores in that national test. The following calculated column will give you the national ranking for each of the local students. Code =RANK.EQ(Students[Test_Score], NationalScores[Test_Score]) Comments RANKX Function Returns the ranking of a number in a list of numbers for each row in the table argument. Syntax RANKX(<table>, <expression>[, <value>[, <order>[, <ties>]]][, <expression>[, <value>[, <order>[, <ties>]]]]…) Parameters Parameter Description Any DAX expression that returns a table of data over which the expression is evaluated. Any DAX expression that returns a single scalar value. The expression 248 is evaluated for each row of table, to generate all possible values for ranking. See the remarks section to understand the function behavior when expression evaluates to BLANK. (Optional) Any DAX expression that returns a single scalar value whose rank is to be found. See the remarks section to understand the function’s behavior when value is not found in the expression. When the value parameter is omitted, the value of expression at the current row is used instead. (Optional) A value that specifies how to rank value, low to high or high to low: value alternate value Description 0 (zero) FALSE Ranks in descending order of values of expression. If value is equal to the highest number in expression then RANKX returns 1. This is the default value when order parameter is omitted. 1 TRUE Ranks in ascending order of 249 expression. If value is equal to the lowest number in expression then RANKX returns 1. (Optional) An enumeration that defines how to determine ranking when there are ties. enumeration Description Skip The next rank value, after a tie, is the rank value of the tie plus the count of tied values. For example if five (5) values are tied with a rank of 11 then the next value will receive a rank of 16 (11 + 5). This is the default value when ties parameter is omitted. Dense The next rank value, after a tie, is the next rank value. For example if five (5) values are tied with a rank of 11 then the next value will receive a rank of 12. Return Value 250 The rank number of value among all possible values of expression evaluated for all rows of table numbers. Exceptions Remarks • If expression or value evaluates to BLANK it is treated as a 0 (zero) for all expressions that result in a number, or as an empty text for all text expressions. • If value is not among all possible values of expression then RANKX temporarily adds value to the values from expression and re-evaluates RANKX to determine the proper rank of value. • Optional arguments might be skipped by placing an empty comma (,) in the argument list, i.e. RANKX(Inventory, [InventoryCost],,,"Dense") Example Description The following calculated column in the Products table calculates the sales ranking for each product in the Internet channel. Code =RANKX(ALL(Products), SUMX(RELATEDTABLE(InternetSales), [SalesAmount])) Comments ROW Function Returns a table with a single row containing values that result from the expressions given to each column. Syntax ROW(<name>, <expression>][,<name>, <expression>]…]) Parameters Parameter Description name The name given to the column, enclosed in double quotes. expression Any DAX expression that returns a single scalar value to populate. name. Return Value 251 A single row table Remarks Arguments must always come in pairs of name and expression. Example Description The following example returns a single row table with the total sales for internet and resellers channels. Code ROW("Internet Total Sales (USD)", SUM(InternetSales_USD[SalesAmount_USD]), "Resellers Total Sales (USD)", SUM(ResellerSales_USD[SalesAmount_USD])) Comments The code is split in two lines for readability purposes STDEV.S Function Returns the standard deviation of a sample population. Syntax STDEV.S(<ColumnName>) Parameters Parameter Description columnName The name of an existing column using standard DAX syntax, usually fully qualified. It cannot be an expression. Return Value A number that represents the standard deviation of a sample population. Exceptions Remarks 1. STDEV.S assumes that the column refers to a sample of the population. If your data represents the entire population, then compute the standard deviation by using STDEV.P. 2. STDEV.S uses the following formula: 252 - )²/(n-1)] and n is the population size 3. Blank rows are filtered out from columnName and not considered in the calculations. 4. An error is returned if columnName contains less than 2 non-blank rows. This DAX function may return different results when used in a model that is deployed and then queried in DirectQuery mode. For more information about semantic differences in DirectQuery mode, see http://go.microsoft.com/fwlink/?LinkId=219171. Example Description The following example shows the formula for a measure that calculates the standard deviation of the column, SalesAmount_USD, when the table InternetSales_USD is the sample population. Code =STDEV.S(InternetSales_USD[SalesAmount_USD]) STDEV.P Function Returns the standard deviation of the entire population. Syntax STDEV.P(<ColumnName>) Parameters Parameter Description The name of an existing column using standard DAX syntax, usually fully qualified. It cannot be an expression. Return Value A number representing the standard deviation of the entire population. Exceptions Remarks 1. STDEV.P assumes that the column refers to the entire population. If your data represents a sample of the population, then compute the standard deviation by using STDEV.S. 253 2. STDEV.P uses the following formula: - )²/n] pulation and n is the population size 3. Blank rows are filtered out from columnName and not considered in the calculations. 4. An error is returned if columnName contains less than 2 non-blank rows This DAX function may return different results when used in a model that is deployed and then queried in DirectQuery mode. For more information about semantic differences in DirectQuery mode, see http://go.microsoft.com/fwlink/?LinkId=219171. Example Description The following example shows the formula for a measure that calculates the standard deviation of the column, SalesAmount_USD, when the table InternetSales_USD is the entire population. Code =STDEV.P(InternetSales_USD[SalesAmount_USD]) STDEVX.S Function Returns the standard deviation of a sample population. Syntax STDEVX.S(<table>, <expression>) Parameters Parameter Description Any DAX expression that returns a single scalar value, where the expression is to be evaluated multiple times (for each row/context). Any DAX expression that returns a single scalar value, where the expression is to be evaluated multiple times (for each row/context). Return Value A number with the standard deviation of a sample population. 254 Exceptions Remarks 1. STDEVX.S evaluates expression for each row of table and returns the standard deviation of expression assuming that table refers to a sample of the population. If table represents the entire population, then compute the standard deviation by using STDEVX.P. 2. STDEVX.S uses the following formula: - )²/(n-1)] and n is the population size 3. Blank rows are filtered out from columnName and not considered in the calculations. 4. An error is returned if columnName contains less than 2 non-blank rows. This DAX function may return different results when used in a model that is deployed and then queried in DirectQuery mode. For more information about semantic differences in DirectQuery mode, see http://go.microsoft.com/fwlink/?LinkId=219171. Example Description The following example shows the formula for a calculated column that estimates the standard deviation of the unit price per product for a sample population, when the formula is used in the Product table. Code =STDEVX.S(RELATEDTABLE(InternetSales_USD), InternetSales_USD[UnitPrice_USD] – (InternetSales_USD[DiscountAmount_USD]/InternetSales_USD[OrderQuantity] )) STDEVX.P Function Returns the standard deviation of the entire population. Syntax STDEVX.P(<table>, <expression>) Parameters Parameter Description table Any DAX expression that returns a table of data. 255 expression Any DAX expression that returns a single scalar value, where the expression is to be evaluated multiple times (for each row/context). Return Value A number that represents the standard deviation of the entire population. Remarks 1. STDEVX.P evaluates expression for each row of table and returns the standard deviation of expression assuming that table refers to the entire population. If the data in table represents a sample of the population, you should compute the standard deviation by using STDEVX.S instead. 2. STDEVX.P uses the following formula: - )²/n] and n is the population size 3. Blank rows are filtered out from columnName and not considered in the calculations. 4. An error is returned if columnName contains less than 2 non-blank rows This DAX function may return different results when used in a model that is deployed and then queried in DirectQuery mode. For more information about semantic differences in DirectQuery mode, see http://go.microsoft.com/fwlink/?LinkId=219171. Example Description The following example shows the formula for a calculated column that calculates the standard deviation of the unit price per product, when the formula is used in the Product table. Code =STDEVX.P(RELATEDTABLE(InternetSales_USD), InternetSales_USD[UnitPrice_USD] – (InternetSales_USD[DiscountAmount_USD]/InternetSales_USD[OrderQuantity] )) SUMMARIZE Function Returns a summary table for the requested totals over a set of groups. Syntax 256 SUMMARIZE(<table>, <groupBy_columnName>[, <groupBy_columnName>]…[, <name>, <expression>]…) Parameters Parameter Description Any DAX expression that returns a table of data. The qualified name of an existing column to be used to create summary groups based on the values found in it. This parameter cannot be an expression. The name given to a total or summarize column, enclosed in double quotes. Any DAX expression that returns a single scalar value, where the expression is to be evaluated multiple times (for each row/context). Return Value A table with the selected columns for the groupBy_columnName arguments and the summarized columns designed by the name arguments. Remarks 1. Each column for which you define a name must have a corresponding expression; otherwise, an error is returned. The first argument, name, defines the name of the column in the results. The second argument, expression, defines the calculation performed to obtain the value for each row in that column. 2. groupBy_columnName must be either in table or in a related table to table. 3. Each name must be enclosed in double quotation marks. 4. The function groups a selected set of rows into a set of summary rows by the values of one or more groupBy_columnName columns. One row is returned for each group. Example Description The following example returns a summary of the reseller sales grouped around the calendar year and the product category name, this result table allows you to do analysis over the reseller sales by year and product category. 257 Code SUMMARIZE(ResellerSales_USD , DateTime[CalendarYear] , ProductCategory[ProductCategoryName] , "Sales Amount (USD)", SUM(ResellerSales_USD[SalesAmount_USD]) , "Discount Amount (USD)", SUM(ResellerSales_USD[DiscountAmount]) ) Comments The following table shows a preview of the data as it would be received by any function expecting to receive a table: DateTime[CalendarY ear] ProductCategory[ProductCategory Name] [Sales Amount (USD)] [Discount Amount (USD)] 2008 Bikes 12968255. 42 36167.659 2 2005 Bikes 6958251.0 43 4231.1621 2006 Bikes 18901351. 08 178175.83 99 2007 Bikes 24256817. 5 276065.99 2 2008 Components 2008052.7 06 39.9266 2005 Components 574256.98 65 0 2006 Components 3428213.0 5 948.7674 2007 Components 5195315.2 16 4226.0444 2008 Clothing 366507.84 4 4151.1235 2005 Clothing 31851.162 8 90.9593 258 2006 Clothing 455730.97 29 4233.039 2007 Clothing 815853.28 68 12489.383 5 2008 Accessories 153299.92 4 865.5945 2005 Accessories 18594.478 2 4.293 2006 Accessories 86612.746 3 1061.4872 2007 Accessories 275794.84 03 4756.6546 Advanced SUMMARIZE options SUMMARIZE with ROLLUP The addition of the ROLLUP() syntax modifies the behavior of the SUMMARIZE function by adding roll-up rows to the result on the groupBy_columnName columns. SUMMARIZE(<table>, <groupBy_columnName>[, <groupBy_columnName>]…[, ROLLUP(<groupBy_columnName>[,< groupBy_columnName>…])][, <name>, <expression>]…) ROLLUP parameters groupBy_columnName The qualified name of an existing column to be used to create summary groups based on the values found in it. This parameter cannot be an expression. Note: All other SUMMARIZE parameters are explained before and not repeated here for brevity. Remarks • The columns mentioned in the ROLLUP expression cannot be referenced as part of a groupBy_columnName columns. Example The following example adds roll-up rows to the Group-By columns of the SUMMARIZE function call. SUMMARIZE(ResellerSales_USD , ROLLUP( DateTime[CalendarYear], ProductCategory[ProductCategoryName]) , "Sales Amount (USD)", SUM(ResellerSales_USD[SalesAmount_USD]) 259 , "Discount Amount (USD)", SUM(ResellerSales_USD[DiscountAmount]) ) The following table shows a preview of the data as it would be received by any function expecting to receive a table: DateTime[CalendarY ear] ProductCategory[ProductCategory Name] [Sales Amount (USD)] [Discount Amount (USD)] 2008 Bikes 12968255. 42 36167.659 2 2005 Bikes 6958251.0 43 4231.1621 2006 Bikes 18901351. 08 178175.83 99 2007 Bikes 24256817. 5 276065.99 2 2008 Components 2008052.7 06 39.9266 2005 Components 574256.98 65 0 2006 Components 3428213.0 5 948.7674 2007 Components 5195315.2 16 4226.0444 2008 Clothing 366507.84 4 4151.1235 2005 Clothing 31851.162 8 90.9593 2006 Clothing 455730.97 29 4233.039 2007 Clothing 815853.28 68 12489.383 5 2008 Accessories 153299.92 4 865.5945 260 2005 Accessories 18594.478 2 4.293 2006 Accessories 86612.746 3 1061.4872 2007 Accessories 275794.84 03 4756.6546 2008 15496115. 89 41224.303 8 2005 7582953.6 7 4326.4144 2006 22871907. 85 184419.13 35 2007 30543780. 84 297538.07 45 76494758. 25 527507.92 62 SUMMARIZE with ISSUBTOTAL Enables the user to create another column, in the Summarize function, that returns True if the row contains sub-total values for the column given as argument to ISSUBTOTAL, otherwise returns False. SUMMARIZE(<table>, <groupBy_columnName>[, <groupBy_columnName>]…[, ROLLUP(<groupBy_columnName>[,< groupBy_columnName>…])][, <name>, {<expression>|ISSUBTOTAL(<columnName>)}]…) ISSUBTOTAL parameters columnName The name of any column in table of the SUMMARIZE function or any column in a related table to table. Return Value A True value if the row contains a sub-total value for the column given as argument, otherwise returns False Remarks • ISSUBTOTAL can only be used in the expression part of a SUMMARIZE function. • ISSUBTOTAL must be preceded by a matching name column. Example 261 The following sample generates an ISSUBTOTAL() column for each of the ROLLUP() columns in the given SUMMARIZE() function call. SUMMARIZE(ResellerSales_USD , ROLLUP( DateTime[CalendarYear], ProductCategory[ProductCategoryName]) , "Sales Amount (USD)", SUM(ResellerSales_USD[SalesAmount_USD]) , "Discount Amount (USD)", SUM(ResellerSales_USD[DiscountAmount]) , "Is Sub Total for DateTimeCalendarYear", ISSUBTOTAL(DateTime[CalendarYear]) , "Is Sub Total for ProductCategoryName", ISSUBTOTAL(ProductCategory[ProductCategoryName]) ) The following table shows a preview of the data as it would be received by any function expecting to receive a table: [Is Sub Total for DateTimeCal endarYear] [Is Sub Total DateTime[Ca lendarYear] for ProductCate goryName] ProductCategory[Prod [Sales uctCategoryName] Amou nt (USD) ] FALSE FALSE FALSE FALSE 2008 Bikes 12968 36167. 255.42 6592 FALSE FALSE 2005 Bikes 69582 4231.1 51.043 621 FALSE FALSE 2006 Bikes 18901 17817 351.08 5.8399 FALSE FALSE 2007 Bikes 24256 817.5 FALSE FALSE 2008 Components 20080 39.926 52.706 6 FALSE FALSE 2005 Components 57425 0 6.9865 FALSE FALSE 2006 Components 34282 [Disco unt Amou nt (USD) ] 27606 5.992 948.76 262 13.05 74 FALSE FALSE 2007 Components 51953 4226.0 15.216 444 FALSE FALSE 2008 Clothing 36650 7.844 FALSE FALSE 2005 Clothing 31851. 90.959 1628 3 FALSE FALSE 2006 Clothing 45573 4233.0 0.9729 39 FALSE FALSE 2007 Clothing 81585 12489. 3.2868 3835 FALSE FALSE 2008 Accessories 15329 9.924 FALSE FALSE 2005 Accessories 18594. 4.293 4782 FALSE FALSE 2006 Accessories 86612. 1061.4 7463 872 FALSE FALSE 2007 Accessories 27579 4756.6 4.8403 546 FALSE TRUE FALSE TRUE 2008 15496 41224. 115.89 3038 FALSE TRUE 2005 75829 53.67 FALSE TRUE 2006 22871 18441 907.85 9.1335 FALSE TRUE 2007 30543 29753 780.84 8.0745 TRUE TRUE 4151.1 235 865.59 45 4326.4 144 76494 52750 758.25 7.9262 TOPN Function Returns the top N rows of the specified table. 263 Syntax TOPN(<n_value>, <table>, <orderBy_expression>, [<order>[, <orderBy_expression>, [<order>]]…]) Parameters Parameter Description The number of rows to return. It is any DAX expression that returns a single scalar value, where the expression is to be evaluated multiple times (for each row/context). See the remarks section to understand when the number of rows returned could possible be larger than n_value. See the remarks section to understand when an empty table is returned. Any DAX expression that returns a table of data from where to extract the top ‘n’ rows. Any DAX expression where the result value is used to sort the table and it is evaluated for each row of table. (Optional) A value that specifies how to sort orderBy_expression values, ascending or descending: value alternate value Description 0 (zero) FALSE Sorts in descending order of values of order_by. This is the 264 default value when order parameter is omitted. 1 TRUE Ranks in ascending order of order_by. Return Value A table with the top N rows of table or an empty table if n_value is 0 (zero) or less. Rows are not necessarily sorted in any particular order. Remarks • If there is a tie, in order_by values, at the N-th row of the table, then all tied rows are returned. Then, when there are ties at the N-th row the function might return more than n rows. • If n_value is 0 (zero) or less then TOPN returns an empty table. • TOPN does not guarantee any sort order for the results. Example Description The following sample creates a measure with the sales of the top 10 sold products. Code =SUMX(TOPN(10, SUMMARIZE(Product, [ProductKey], “TotalSales”, SUMX(RELATED(InternetSales_USD[SalesAmount_USD]), InternetSales_USD[SalesAmount_USD]) + SUMX(RELATED(ResellerSales_USD[SalesAmount_USD]), ResellerSales_USD[SalesAmount_USD])) Comments VAR.S Function Returns the variance of a sample population. Syntax VAR.S(<columnName>) Parameters 265 Parameter Description The name of an existing column using standard DAX syntax, usually fully qualified. It cannot be an expression. Return Value A number with the variance of a sample population. Exceptions Remarks 1. VAR.S assumes that the column refers to a sample of the population. If your data represents the entire population, then compute the variance by using VAR.P. 2. VAR.S uses the following formula: - )²/(n-1) and n is the population size 3. Blank rows are filtered out from columnName and not considered in the calculations. 4. An error is returned if columnName contains less than 2 non-blank rows. This DAX function may return different results when used in a model that is deployed and then queried in DirectQuery mode. For more information about semantic differences in DirectQuery mode, see http://go.microsoft.com/fwlink/?LinkId=219171. Example Description The following example shows the formula for a measure that calculates the variance of the SalesAmount_USD column from the InternetSales_USD for a sample population. Code =VAR.S(InternetSales_USD[SalesAmount_USD]) VAR.P Function Returns the variance of the entire population. Syntax VAR.P(<columnName>) Parameters Parameter Description 266 The name of an existing column using standard DAX syntax, usually fully qualified. It cannot be an expression. Return Value A number with the variance of the entire population. Remarks 1. VAR.P assumes that the column refers the entire population. If your data represents a sample of the population, then compute the variance by using VAR.S. 2. VAR.P uses the following formula: - )²/n entire population and n is the population size 3. Blank rows are filtered out from columnName and not considered in the calculations. 4. An error is returned if columnName contains less than 2 non-blank rows This DAX function may return different results when used in a model that is deployed and then queried in DirectQuery mode. For more information about semantic differences in DirectQuery mode, see http://go.microsoft.com/fwlink/?LinkId=219171. Example Description The following example shows the formula for a measure that estimates the variance of the SalesAmount_USD column from the InternetSales_USD table, for the entire population. Code =VAR.P(InternetSales_USD[SalesAmount_USD]) VARX.S Function Returns the variance of a sample population. Syntax VARX.S(<table>, <expression>) Parameters Parameter Description Any DAX expression that returns a table of data. 267 Any DAX expression that returns a single scalar value, where the expression is to be evaluated multiple times (for each row/context). Return Value A number that represents the variance of a sample population. Exceptions Remarks 1. VARX.S evaluates expression for each row of table and returns the variance of expression; on the assumption that table refers to a sample of the population. If table represents the entire population, then you should compute the variance by using VARX.P. 2. VAR.S uses the following formula: - )²/(n-1) and n is the population size 3. Blank rows are filtered out from columnName and not considered in the calculations. 4. An error is returned if columnName contains less than 2 non-blank rows. This DAX function may return different results when used in a model that is deployed and then queried in DirectQuery mode. For more information about semantic differences in DirectQuery mode, see http://go.microsoft.com/fwlink/?LinkId=219171. Example Description The following example shows the formula for a calculated column that estimates the variance of the unit price per product for a sample population, when the formula is used in the Product table. Code =VARX.S(InternetSales_USD, InternetSales_USD[UnitPrice_USD] – (InternetSales_USD[DiscountAmount_USD]/InternetSales_USD[OrderQuantity] )) VARX.P Function Returns the variance of the entire population. Syntax 268 VARX.P(<table>, <expression>) Parameters Parameter Description table Any DAX expression that returns a table of data. expression Any DAX expression that returns a single scalar value, where the expression is to be evaluated multiple times (for each row/context). Return Value A number with the variance of the entire population. Exceptions Remarks 1. VARX.P evaluates <expression> for each row of <table> and returns the variance of <expression> assuming that <table> refers to the entire population.. If <table> represents a sample of the population, then compute the variance by using VARX.S. 2. VARX.P uses the following formula: - )²/n and n is the population size 3. Blank rows are filtered out from columnName and not considered in the calculations. 4. An error is returned if columnName contains less than 2 non-blank rows This DAX function may return different results when used in a model that is deployed and then queried in DirectQuery mode. For more information about semantic differences in DirectQuery mode, see http://go.microsoft.com/fwlink/?LinkId=219171. Example Description The following example shows the formula for a calculated column that calculates the variance of the unit price per product, when the formula is used in the Product table Code =VARX.P(InternetSales_USD, InternetSales_USD[UnitPrice_USD] – (InternetSales_USD[DiscountAmount_USD]/InternetSales_USD[OrderQuantity] )) 269 Text Functions Data Analysis Expressions (DAX) includes a set of text functions that is based on the library of string functions in Excel, but which has been modified to work with tables and columns. This section lists all text functions available in the DAX language. In this Section BLANK Function (DAX) CONCATENATE Function (DAX) EXACT Function (DAX) FIND Function (DAX) FIXED Function (DAX) FORMAT Function (DAX) • Pre-defined numeric formats for the FORMAT function (DAX) • Custom numeric formats for the FORMAT function (DAX) • Pre-defined Date and Time formats for the FORMAT function (DAX) • Custom Date and Time formats for the FORMAT function (DAX) LEFT Function (DAX) LEN Function (DAX) LOWER Function (DAX) MID Function (DAX) REPLACE Function (DAX) REPT Function (DAX) RIGHT Function (DAX) SEARCH Function (DAX) SUBSTITUTE Function (DAX) TRIM Function (DAX) UPPER Function (DAX) VALUE Function (DAX) See Also Function Reference (DAX) Date and Time Functions (DAX) Filter and Value Functions (DAX) Information Functions (DAX) Logical Functions (DAX) Math and Trigonometric Functions (DAX) Statistical Functions (DAX) 270 Time Intelligence Functions (DAX) BLANK Function Returns a blank. Syntax BLANK() Return Value A blank. Remarks Blanks are not equivalent to nulls. DAX uses blanks for both database nulls and for blank cells in Excel. For more information, see Data Types in DAX. Some DAX functions treat blank cells somewhat differently from Microsoft Excel. Blanks and empty strings ("") are not always equivalent, but some operations may treat them as such. For details on the behavior of an individual function or operator, see Function Reference. Example Description The following example illustrates how you can work with blanks in formulas. The formula calculates the ratio of sales between the Resellers and the Internet channels. However, before attempting to calculate the ratio the denominator should be checked for zero values. If the denominator is zero then a blank value should be returned; otherwise, the ratio is calculated. Code =IF( SUM(InternetSales_USD[SalesAmount_USD])= 0 , BLANK() , SUM(ResellerSales_USD[SalesAmount_USD])/SUM(InternetSales_USD[SalesAmou nt_USD]) ) Comments The table shows the expected results when this formula is used to create a PivotTable. Reseller to Column Labels Internet sales ratio Row Labels Accessories Bikes Clothing Grand Total 2005 2.65 2.89 2006 3.33 4.03 271 Reseller to Column Labels Internet sales ratio 2007 1.04 2.92 6.63 3.51 2008 0.41 1.53 2.00 1.71 Grand Total 0.83 2.51 5.45 2.94 Note that, in the original data source, the column evaluated by the BLANK function might have included text, empty strings, or nulls. If the original data source was a SQL Server database, nulls and empty strings are different kinds of data. However, for this operation an implicit type cast is performed and DAX treats them as the same. See Also Text Functions ISBLANK CONCATENATE Function Joins two text strings into one text string. Syntax CONCATENATE(<text1>, <text2>) Parameters Term Definition text1, text2 The text strings to be joined into a single text string. Strings can include text or numbers. You can also use column references. Return Value The concatenated string. Remarks The CONCATENATE function joins two text strings into one text string. The joined items can be text, numbers or Boolean values represented as text, or a combination of those items. You can also use a column reference if the column contains appropriate values. 272 The CONCATENATE function in DAX accepts only two arguments, whereas the Excel CONCATENATE function accepts up to 255 arguments. If you need to concatenate multiple columns, you can create a series of calculations or, better, use the concatenation operator (&) to join all of them in a simpler expression. If you want to use text strings directly, rather than using a column reference, you must enclose each string in double quotation marks. This DAX function may return different results when used in a model that is deployed and then queried in DirectQuery mode. For more information about semantic differences in DirectQuery mode, see http://go.microsoft.com/fwlink/?LinkId=219171. Example: Concatenation of Literals Description The sample formula creates a new string value by combining two string values that you provide as arguments. Code =CONCATENATE("Hello ", "World") Example: Concatenation of Strings in Columns Description The sample formula returns the customer's full name as listed in a phone book. Note how a nested function is used as the second argument. This is one way to concatenate multiple strings, when you have more than two values that you want to use as arguments. Code =CONCATENATE(Customer[LastName], CONCATENATE(", ", Customer[FirstName])) Example: Conditional Concatenation of Strings in Columns Description The sample formula creates a new calculated column in the Customer table with the full customer name as a combination of first name, middle initial, and last name. If there is no middle name, the last name comes directly after the first name. If there is a middle name, only the first letter of the middle name is used and the initial letter is followed by a period. Code =CONCATENATE( [FirstName]&" ", CONCATENATE( IF( LEN([MiddleName])>1, LEFT([MiddleName],1)&" ", ""), [LastName])) Comments This formula uses nested CONCATENATE and IF functions, together with the ampersand (&) operator, to conditionally concatenate three string values and add spaces as separators. Example: Concatenation of Columns with Different Data Types 273 The following example demonstrates how to concatenate values in columns that have different data types. If the value that you are concatenating is numeric, the value will be implicitly converted to text. If both values are numeric, both values will be cast to text and concatenated as if they were strings. Product description Product abbreviation Product number New generated key (column 1 of composite (column 2 of column key) composite key) Mountain bike MTN 40 MTN40 Mountain bike MTN 42 MTN42 Code =CONCATENATE('Products'[Product abbreviation],'Products'[Product number]) Comments The CONCATENATE function in DAX accepts only two arguments, whereas the Excel CONCATENATE function accepts up to 255 arguments. If you need to add more arguments, you can use the ampersand (&) operator. For example, the following formula produces the results, MTN-40 and MTN-42. =[Product abbreviation] & "-" & [Product number] See Also Text functions EXACT Function Compares two text strings and returns TRUE if they are exactly the same, FALSE otherwise. EXACT is case-sensitive but ignores formatting differences. You can use EXACT to test text being entered into a document. Syntax EXACT(<text1>,<text2>) Parameters Term Definition text1 The first text string or column that contains text. 274 Term Definition text2 The second text string or column that contains text. Property Value/Return Value True or false. (Boolean) Example Description The following formula checks the value of Column1 for the current row against the value of Column2 for the current row, and returns TRUE if they are the same, and returns FALSE if they are different. Code =EXACT([Column1],[Column2]) See Also Text functions FIND Function Returns the starting position of one text string within another text string. FIND is casesensitive. Syntax FIND(<find_text>, <within_text>[, [<start_num>][, <NotFoundValue>]]) Parameters Term Definition find_text The text you want to find. Use double quotes (empty text) to match the first character in within_text. You can use wildcard characters — the question mark (?) and asterisk (*) — in find_text. A question mark matches any single character; an asterisk matches any sequence of characters. If you want to find an actual question mark or asterisk, type a tilde (~) before the character. within_text The text containing the text you want to 275 Term Definition find. start_num (optional) The character at which to start the search; if omitted, start_num = 1. The first character in within_text is character number 1. NotFoundValue (optional) The value that should be returned when the operation does not find a matching substring, typically 0, -1, or BLANK(). Property Value/Return Value Number that shows the starting point of the text string you want to find. Remarks Whereas Microsoft Excel has multiple versions of the FIND function to accommodate single-byte character set (SBCS) and double-byte character set (DBCS) languages, DAX uses Unicode and counts each character the same way; therefore, you do not need to use a different version depending on the character type. This DAX function may return different results when used in a model that is deployed and then queried in DirectQuery mode. For more information about semantic differences in DirectQuery mode, see http://go.microsoft.com/fwlink/?LinkId=219171. Example Description The following formula finds the position of the first letter of the product designation, BMX, in the string that contains the product description. Code =FIND("BMX","line of BMX racing goods") See Also Text functions FIXED Function Rounds a number to the specified number of decimals and returns the result as text. You can specify that the result be returned with or without commas. Syntax FIXED(<number>, <decimals>, <no_commas>) 276 Parameters Term Definition number The number you want to round and convert to text, or a column containing a number. decimals (optional) The number of digits to the right of the decimal point; if omitted, 2. no_commas (optional) A logical value: if 1, do not display commas in the returned text; if 0 or omitted, display commas in the returned text. Property Value/Return Value A number represented as text. Remarks If the value used for the decimals parameter is negative, number is rounded to the left of the decimal point. If you omit decimals, it is assumed to be 2. If no_commas is 0 or is omitted, then the returned text includes commas as usual. The major difference between formatting a cell containing a number by using a command and formatting a number directly with the FIXED function is that FIXED converts its result to text. A number formatted with a command from the formatting menu is still a number. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. Example Description The following example gets the numeric value for the current row in column, PctCost, and returns it as text with 4 decimal places and no commas. Code =FIXED([PctCost],3,1) Comments Numbers can never have more than 15 significant digits, but decimals can be as large as 127. See Also 277 Text functions Math and trig functions FORMAT Function Converts a value to text according to the specified format. Syntax FORMAT(<value>, <format_string>) Parameters Term Definition value A value or expression that evaluates to a single value. format_string A string with the formatting template. Return Value A string containing value formatted as defined by format_string. Important • If value is BLANK() the function returns an empty string. • If format_string is BLANK(), the value is formatted with a "General Number" or "General Date" format (according to value type). Remarks For information on how to use the format_string parameter, see the appropriate topic listed below: To Format Follow these instructions Numbers Use predefined numeric formats or create user-defined numeric formats. Dates and times Use predefined date/time formats or create user-defined date/time formats. All predefined formatting strings use the current user locale when formatting the result. Caution 278 The format strings supported as an argument to the DAX FORMAT function are based on the format strings used by Visual Basic (OLE Automation), not on the format strings used by the .NET Framework. Therefore, you might get unexpected results or an error if the argument does not match any defined format strings. For example, “p” as an abbreviation for “Percent” is not supported. Strings that you provide as an argument to the FORMAT function that are not included in the list of predefined format strings are handled as part of a custom format string, or as a string literal. This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see http://go.microsoft.com/fwlink/?LinkId=219172. See Also predefined numeric formats user-defined numeric formats predefined date/time formats user-defined date/time formats VALUE Pre-Defined Numeric Formats for the FORMAT Function The following table identifies the predefined numeric format names. These may be used by name as the style argument for the Format function. Format specification Description "General Number" Displays number with no thousand separators. "Currency" Displays number with thousand separators, if appropriate; displays two digits to the right of the decimal separator. Output is based on system locale settings. "Fixed" Displays at least one digit to the left and two digits to the right of the decimal separator. "Standard" Displays number with thousand separators, at least one digit to the left and two digits to the right of the decimal separator. "Percent" Displays number multiplied by 100 with a percent sign (%) appended immediately to 279 Format specification Description the right; always displays two digits to the right of the decimal separator. "Scientific" Uses standard scientific notation, providing two significant digits. "Yes/No" Displays No if number is 0; otherwise, displays Yes. "True/False" Displays False if number is 0; otherwise, displays True. "On/Off" Displays Off if number is 0; otherwise, displays On. Remarks Note that format strings are based on Visual Basic (OLE Automation) and therefore might have slightly different behavior than the format strings used by the .NET Framework. Abbreviations such as “P” and “x” are not supported. Any other strings that you provide as an argument to the FORMAT function are interpreted as defining a custom format. Important • If value is BLANK() the function returns an empty string. • If format_string is BLANK(), the value is formatted with a "General Number" format. Example Description The following samples show the usage of different predefined formatting strings to format a numeric value. Code FORMAT( 12345.67, "General Number") FORMAT( 12345.67, "Currency") FORMAT( 12345.67, "Fixed") FORMAT( 12345.67, "Standard") FORMAT( 12345.67, "Percent") FORMAT( 12345.67, "Scientific") Comments The above expressions return the following results: 280 12345.67 "General Number" displays the number with no formatting. $12,345.67 "Currency" displays the number with your currency locale formatting. The sample here shows the default United States currency formatting. 12345.67 "Fixed" displays at least one digit to the left of the decimal separator and two digits to the right of the decimal separator. 12,345.67 " Standard " displays at least one digit to the left of the decimal separator and two digits to the right of the decimal separator, and includes thousand separators. The sample here shows the default United States number formatting. 1,234,567.00 % "Percent" displays the number as a percentage (multiplied by 100) with formatting and the percent sign at the right of the number separated by a single space. 1.23E+04 "Scientific" displays the number in scientific notation with two decimal digits. See Also FORMAT Predefined date formats Custom numeric formats Custom Numeric Formats for the FORMAT Function A user-defined format expression for numbers can have from one to three sections separated by semicolons. If the Style argument of the Format function contains one of the predefined numeric formats, only one section is allowed. If you use This is the result One section only The format expression applies to all values. Two sections The first section applies to positive values and zeros; the second applies to negative values. Three sections The first section applies to positive values, the second applies to negative values, and the third applies to zeros. Format Specifications The following table identifies characters you can use to create user-defined number formats. Format specification Description None Displays the number with no formatting. 281 Format specification Description 0 (zero character) Digit placeholder. Displays a digit or a zero. If the expression has a digit in the position where the zero appears in the format string, displays the digit; otherwise, displays a zero in that position. If the number has fewer digits than there are zeros (on either side of the decimal) in the format expression, displays leading or trailing zeros. If the number has more digits to the right of the decimal separator than there are zeros to the right of the decimal separator in the format expression, rounds the number to as many decimal places as there are zeros. If the number has more digits to the left of the decimal separator than there are zeros to the left of the decimal separator in the format expression, displays the extra digits without modification. # Digit placeholder. Displays a digit or nothing. If the expression has a digit in the position where the # character appears in the format string, displays the digit; otherwise, displays nothing in that position. This symbol works like the 0 digit placeholder, except that leading and trailing zeros aren't displayed if the number has fewer digits than there are # characters on either side of the decimal separator in the format expression. . (dot character) Decimal placeholder. The decimal placeholder determines how many digits are displayed to the left and right of the decimal separator. If the format expression contains only # characters to the left of this symbol; numbers smaller than 1 begin with a decimal separator. To display a leading zero displayed with fractional numbers, use zero as the first digit placeholder to the left of the decimal separator. In some locales, a 282 Format specification Description comma is used as the decimal separator. The actual character used as a decimal placeholder in the formatted output depends on the number format recognized by your system. Thus, you should use the period as the decimal placeholder in your formats even if you are in a locale that uses a comma as a decimal placeholder. The formatted string will appear in the format correct for the locale. % Percent placeholder. Multiplies the expression by 100. The percent character (%) is inserted in the position where it appears in the format string. , (comma character) Thousand separator. The thousand separator separates thousands from hundreds within a number that has four or more places to the left of the decimal separator. Standard use of the thousand separator is specified if the format contains a thousand separator surrounded by digit placeholders (0 or #). A thousand separator immediately to the left of the decimal separator (whether or not a decimal is specified) or as the rightmost character in the string means "scale the number by dividing it by 1,000, rounding as needed." Numbers smaller than 1,000 but greater or equal to 500 are displayed as 1, and numbers smaller than 500 are displayed as 0. Two adjacent thousand separators in this position scale by a factor of 1 million, and an additional factor of 1,000 for each additional separator. Multiple separators in any position other than immediately to the left of the decimal separator or the rightmost position in the string are treated simply as specifying the use of a thousand separator. In some 283 Format specification Description locales, a period is used as a thousand separator. The actual character used as the thousand separator in the formatted output depends on the Number Format recognized by your system. Thus, you should use the comma as the thousand separator in your formats even if you are in a locale that uses a period as a thousand separator. The formatted string will appear in the format correct for the locale. For example, consider the three following format strings: "#,0.", which uses the thousands separator to format the number 100 million as the string "100,000,000". "#0,.", which uses scaling by a factor of one thousand to format the number 100 million as the string "100000". "#,0,.", which uses the thousands separator and scaling by one thousand to format the number 100 million as the string "100,000". : (colon character) Time separator. In some locales, other characters may be used to represent the time separator. The time separator separates hours, minutes, and seconds when time values are formatted. The actual character used as the time separator in formatted output is determined by your system settings. / (forward slash character) Date separator. In some locales, other characters may be used to represent the date separator. The date separator separates the day, month, and year when date values are formatted. The actual character used as the date separator in formatted output is determined by your system settings. E- , E+ , e- , e+ Scientific format. If the format expression contains at least one digit placeholder (0 or 284 Format specification Description #) to the left of E-, E+, e-, or e+, the number is displayed in scientific format and E or e is inserted between the number and its exponent. The number of digit placeholders to the left determines the number of digits in the exponent. Use E- or e- to place a minus sign next to negative exponents. Use E+ or e+ to place a minus sign next to negative exponents and a plus sign next to positive exponents. You must also include digit placeholders to the right of this symbol to get correct formatting. -+$() Literal characters. These characters are displayed exactly as typed in the format string. To display a character other than one of those listed, precede it with a backslash (\) or enclose it in double quotation marks (" "). \ (backward slash character) Displays the next character in the format string. To display a character that has special meaning as a literal character, precede it with a backslash (\). The backslash itself isn't displayed. Using a backslash is the same as enclosing the next character in double quotation marks. To display a backslash, use two backslashes (\\). Examples of characters that can't be displayed as literal characters are the dateformatting and time-formatting characters (a, c, d, h, m, n, p, q, s, t, w, y, /, and :), the numeric-formatting characters (#, 0, %, E, e, comma, and period), and the stringformatting characters (@, &, <, >, and !). "ABC" Displays the string inside the double quotation marks (" "). To include a string in the style argument from within code, you must use Chr(34) to enclose the text (34 is the character code for a quotation mark 285 Format specification Description (")). The following table contains some sample format expressions for numbers. (These examples all assume that your system's locale setting is English-U.S.) The first column contains the format strings for the Format function; the other columns contain the resulting output if the formatted data has the value given in the column headings. Format (Style) "5" formatted "-5" formatted "0.5" formatted "0" formatted as as as as Zero-length string ("") 5 -5 0.5 0 0 5 -5 1 0 0.00 5.00 -5.00 0.50 0.00 #,##0 5 -5 1 0 $#,##0;($#,##0) $5 ($5) $1 $0 $#,##0.00;($#,##0.00) $5.00 ($5.00) $0.50 $0.00 0% 500% -500% 50% 0% 0.00% 500.00% -500.00% 50.00% 0.00% 0.00E+00 5.00E+00 -5.00E+00 5.00E-01 0.00E+00 0.00E-00 5.00E00 -5.00E00 5.00E-01 0.00E00 "$#,##0;;\Z\e\r\o" $5 $-5 $1 Zero Remarks If you include semicolons with nothing between them, the missing section is printed using the format of the positive value. See Also FORMAT Predefined numeric formats Custom date-time formats 286 Pre-defined Date and Time formats for the FORMAT Function The following table identifies the predefined date and time format names. If you use strings other than these predefined strings, they will be interpreted as a custom date and time format. Format specification Description "General Date" Displays a date and/or time. For example, 3/12/2008 11:07:31 AM. Date display is determined by your application's current culture value. "Long Date" or "Medium Date" Displays a date according to your current culture's long date format. For example, Wednesday, March 12, 2008. "Short Date" Displays a date using your current culture's short date format. For example, 3/12/2008. "Long Time" or "Medium Time" Displays a time using your current culture's long time format; typically includes hours, minutes, seconds. For example, 11:07:31 AM. "Short Time" Displays a time using your current culture's short time format. For example, 11:07 AM. Remarks The formatting strings are based on Visual Basic (OLE Automation) and not the .NET Framework formatting strings; therefore, your results might be slightly different than what you expect from .NET format strings. Note that abbreviations such as “D” for Long Date and “t” for Short Time are not supported. Important • If value is BLANK() the function returns an empty string. • If format_string is BLANK(), the value is formatted with a "General Date" format. See Also Custom Date Formats Custom Date and Time formats for the FORMAT Function The following table shows characters you can use to create user-defined date/time formats. 287 Format specification Description (:) Time separator. In some locales, other characters may be used to represent the time separator. The time separator separates hours, minutes, and seconds when time values are formatted. The actual character that is used as the time separator in formatted output is determined by your application's current culture value. (/) Date separator. In some locales, other characters may be used to represent the date separator. The date separator separates the day, month, and year when date values are formatted. The actual character that is used as the date separator in formatted output is determined by your application's current culture. (%) Used to indicate that the following character should be read as a single-letter format without regard to any trailing letters. Also used to indicate that a singleletter format is read as a user-defined format. See what follows for additional details. d Displays the day as a number without a leading zero (for example, 1). Use %d if this is the only character in your user-defined numeric format. dd Displays the day as a number with a leading zero (for example, 01). ddd Displays the day as an abbreviation (for example, Sun). dddd Displays the day as a full name (for example, Sunday). M Displays the month as a number without a leading zero (for example, January is represented as 1). Use %M if this is the only 288 Format specification Description character in your user-defined numeric format. MM Displays the month as a number with a leading zero (for example, 01/12/01). MMM Displays the month as an abbreviation (for example, Jan). MMMM Displays the month as a full month name (for example, January). gg Displays the period/era string (for example, A.D.). h Displays the hour as a number without leading zeros using the 12-hour clock (for example, 1:15:15 PM). Use %h if this is the only character in your user-defined numeric format. hh Displays the hour as a number with leading zeros using the 12-hour clock (for example, 01:15:15 PM). H Displays the hour as a number without leading zeros using the 24-hour clock (for example, 1:15:15). Use %H if this is the only character in your user-defined numeric format. HH Displays the hour as a number with leading zeros using the 24-hour clock (for example, 01:15:15). m Displays the minute as a number without leading zeros (for example, 12:1:15). Use %m if this is the only character in your user-defined numeric format. mm Displays the minute as a number with leading zeros (for example, 12:01:15). s Displays the second as a number without leading zeros (for example, 12:15:5). Use %s if this is the only character in your userdefined numeric format. 289 Format specification Description ss Displays the second as a number with leading zeros (for example, 12:15:05). f Displays fractions of seconds. For example ff displays hundredths of seconds, whereas ffff displays ten-thousandths of seconds. You may use up to seven f symbols in your user-defined format. Use %f if this is the only character in your user-defined numeric format. t Uses the 12-hour clock and displays an uppercase A for any hour before noon; displays an uppercase P for any hour between noon and 11:59 P.M. Use %t if this is the only character in your user-defined numeric format. tt For locales that use a 12-hour clock, displays an uppercase AM with any hour before noon; displays an uppercase PM with any hour between noon and 11:59 P.M. For locales that use a 24-hour clock, displays nothing. y Displays the year number (0-9) without leading zeros. Use %y if this is the only character in your user-defined numeric format. yy Displays the year in two-digit numeric format with a leading zero, if applicable. yyy Displays the year in four-digit numeric format. yyyy Displays the year in four-digit numeric format. z Displays the timezone offset without a leading zero (for example, -8). Use %z if this is the only character in your userdefined numeric format. 290 Format specification Description zz Displays the timezone offset with a leading zero (for example, -08) zzz Displays the full timezone offset (for example, -08:00) Remarks Formatting strings are case sensitive. Different formatting can be obtained by using a different case. For example, when formatting a date value with the string "D" you get the date in the long format (according to your current locale). However, if you change the case to "d" you get the date in the short format. Also, unexpected results or an error might occur if the intended formatting does not match the case of any defined format string. Date/Time formatting uses the current user locale to determine the ultimate format of the string. For example, to format the date March 18, 1995, with the following format string "M/d/yyyy", if the user locale is set to the United States of America (en-us) the result is '3/12/1995', but if the user locale is set to Germany (de-de) the result is '18.03.1995'. See Also FORMAT Custom numeric formats Predefined date and time formats LEFT Function Returns the specified number of characters from the start of a text string. Syntax LEFT(<text>, <num_chars>) Parameters Term Definition text The text string containing the characters you want to extract, or a reference to a column that contains text. num_chars (optional) The number of characters you want LEFT to extract; if omitted, 1. 291 Property Value/Return Value A text string. Remarks Whereas Microsoft Excel contains different functions for working with text in single-byte and double-byte character languages, DAX works with Unicode and stores all characters as the same length; therefore, a single function is enough. This DAX function may return different results when used in a model that is deployed and then queried in DirectQuery mode. For more information about semantic differences in DirectQuery mode, see http://go.microsoft.com/fwlink/?LinkId=219171. Example Description The following example returns the first five characters of the company name in the column [ResellerName] and the first five letters of the geographical code in the column [GeographyKey] and concatenates them, to create an identifier. Code =CONCATENATE(LEFT('Reseller'[ResellerName],LEFT(GeographyKey,3)) Comments If the num_chars argument is a number that is larger than the number of characters available, the function returns the maximum characters available and does not raise an error. For example, the column [GeographyKey] contains numbers such as 1, 12 and 311; therefore the result also has variable length. See Also Text functions LEN Function Returns the number of characters in a text string. Syntax LEN(<text>) Parameters Term Definition text The text whose length you want to find, or a column that contains text. Spaces count as characters. 292 Return Value A whole number indicating the number of characters in the text string. Exceptions Remarks Whereas Microsoft Excel has different functions for working with single-byte and double-byte character languages, DAX uses Unicode and stores all characters with the same length. Therefore, LEN always counts each character as 1, no matter what the default language setting is. If you use LEN with a column that contains non-text values, such as dates or Booleans, the function implicitly casts the value to text, using the current column format. Example Description The following formula sums the lengths of addresses in the columns, [AddressLine1] and [AddressLine2]. Code =LEN([AddressLine1])+LEN([AddressLine2) See Also Text functions LOWER Function Converts all letters in a text string to lowercase. Syntax LOWER(<text>) Parameters Term Definition text The text you want to convert to lowercase, or a reference to a column that contains text. Property Value/Return Value Text in lowercase. Remarks 293 Characters that are not letters are not changed. For example, the formula =LOWER("123ABC") returns 123abc. Example Description The following formula gets each row in the column, [ProductCode], and converts the value to all lowercase. Numbers in the column are not affected. Code =LOWER('New Products'[ProductCode]) See Also Text functions MID Function Returns a string of characters from the middle of a text string, given a starting position and length. Syntax MID(<text>, <start_num>, <num_chars>) Parameters Term Definition text The text string from which you want to extract the characters, or a column that contains text. start_num The position of the first character you want to extract. Positions start at 1. num_chars The number of characters to return. Property Value/Return Value A string of text of the specified length. Remarks Whereas Microsoft Excel has different functions for working with single-byte and double-byte characters languages, DAX uses Unicode and stores all characters with the same length. Example Description 294 The following examples return the same results, the first 5 letters of the column, [ResellerName]. The first example uses the fully qualified name of the column and specifies the starting point; the second example omits the table name and the parameter, num_chars. Code =MID('Reseller'[ResellerName],5,1)) =MID([ResellerName,5]) Comments The results are the same if you use the following formula: =LEFT([ResellerName],5) See Also Text functions REPLACE Function REPLACE replaces part of a text string, based on the number of characters you specify, with a different text string. Syntax REPLACE(<old_text>, <start_num>, <num_chars>, <new_text>) Parameters Term Definition old_text The string of text that contains the characters you want to replace, or a reference to a column that contains text. start_num The position of the character in old_text that you want to replace with new_text. num_chars The number of characters that you want to replace. Warning If the argument, num_chars, is a blank or references a column that evaluates to a blank, the string for new_text is inserted at the position, start_num, without replacing any characters. This is the same 295 Term Definition behavior as in Excel. new_text The replacement text for the specified characters in old_text. Property Value/Return Value A text string. Remarks Whereas Microsoft Excel has different functions for use with single-byte and double-byte character languages, DAX uses Unicode and therefore stores all characters as the same length. This DAX function may return different results when used in a model that is deployed and then queried in DirectQuery mode. For more information about semantic differences in DirectQuery mode, see http://go.microsoft.com/fwlink/?LinkId=219171. Example Description The following formula creates a new calculated column that replaces the first two characters of the product code in column, [ProductCode], with a new two-letter code, OB. Code =REPLACE('New Products'[Product Code],1,2,"OB") See Also Text functions SUBSTITUTE (DAX) REPT Function Repeats text a given number of times. Use REPT to fill a cell with a number of instances of a text string. Syntax REPT(<text>, <num_times>) Parameters Term Definition text The text you want to repeat. 296 Term Definition num_times A positive number specifying the number of times to repeat text. Property Value/Return Value A string containing the changes. Remarks If number_times is 0 (zero), REPT returns a blank. If number_times is not an integer, it is truncated. The result of the REPT function cannot be longer than 32,767 characters, or REPT returns an error. Example: Repeating Literal Strings Description The following example returns the string, 85, repeated three times. Code =REPT("85",3) Example: Repeating Column Values Description The following example returns the string in the column, [MyText], repeated for the number of times in the column, [MyNumber]. Because the formula extends for the entire column, the resulting string depends on the text and number value in each row. Code =REPT([MyText],[MyNumber]) Comments MyText MyNumber CalculatedColumn1 Text 2 TextText Number 0 85 3 858585 See Also Text functions 297 RIGHT Function RIGHT returns the last character or characters in a text string, based on the number of characters you specify. Syntax RIGHT(<text>, <num_chars>) Parameters Term Definition text The text string that contains the characters you want to extract, or a reference to a column that contains text. num_chars (optional) The number of characters you want RIGHT to extract; is omitted, 1. You can also use a reference to a column that contains numbers. If the column reference does not contain text, it is implicitly cast as text. Property Value/Return Value A text string containing the specified right-most characters. Remarks RIGHT always counts each character, whether single-byte or double-byte, as 1, no matter what the default language setting is. This DAX function may return different results when used in a model that is deployed and then queried in DirectQuery mode. For more information about semantic differences in DirectQuery mode, see http://go.microsoft.com/fwlink/?LinkId=219171 Example: Returning a Fixed Number of Characters Description The following formula returns the last two digits of the product code in the New Products table. Code =RIGHT('New Products'[ProductCode],2) Example: Using a Column Reference to Specify Character Count Description 298 The following formula returns a variable number of digits from the product code in the New Products table, depending on the number in the column, MyCount. If there is no value in the column, MyCount, or the value is a blank, RIGHT also returns a blank. Code =RIGHT('New Products'[ProductCode],[MyCount]) See Also Text functions LEFT MID SEARCH Function Returns the number of the character at which a specific character or text string is first found, reading left to right. Search is case-insensitive and accent sensitive. Syntax SEARCH(<find_text>, <within_text>[, [<start_num>][, <NotFoundValue>]]) Parameters Term Definition find_text The text that you want to find. You can use wildcard characters — the question mark (?) and asterisk (*) — in find_text. A question mark matches any single character; an asterisk matches any sequence of characters. If you want to find an actual question mark or asterisk, type a tilde (~) before the character. within_text The text in which you want to search for find_text, or a column containing text. start_num (optional) The character position in within_text at which you want to start searching. If omitted, 1. NotFoundValue (optional) The value that should be returned when the operation does not find a matching substring, typically 0, -1, or BLANK(). 299 Return Value The number of the starting position of the first text string from the first character of the second text string. Remarks 1. The search function is case insensitive. Searching for "N" will find the first occurrence of 'N' or 'n'. 2. The search function is accent sensitive. Searching for "á" will find the first occurrence of 'á' but no occurrences of 'a', 'à', or the capitalized versions 'A', 'Á'. 3. By using this function, you can locate one text string within a second text string, and return the position where the first string starts. 4. You can use the SEARCH function to determine the location of a character or text string within another text string, and then use the MID function to return the text, or use the REPLACE function to change the text. 5. If the find_text cannot be found in within_text, the formula returns an error. This behavior is like Excel, which returns #VALUE if the substring is not found. Nulls in within_text will be interpreted as an empty string in this context. This DAX function may return different results when used in a model that is deployed and then queried in DirectQuery mode. For more information about semantic differences in DirectQuery mode, see http://go.microsoft.com/fwlink/?LinkId=219171. Example: Search within a String Description The following formula finds the position of the letter "n" in the word "printer". Code =SEARCH("n","printer") Comments The formula returns 4 because "n" is the fourth character in the word "printer." Example: Search within a Column Description You can use a column reference as an argument to SEARCH. The following formula finds the position of the character "-" (hyphen) in the column, [PostalCode]. Code =SEARCH("-",[PostalCode]) Comments The return result is a column of numbers, indicating the index position of the hyphen. Example: Error-Handling with SEARCH Description 300 The formula in the preceding example will fail if the search string is not found in every row of the source column. Therefore, the next example demonstrates how to use IFERROR with the SEARCH function, to ensure that a valid result is returned for every row. The following formula finds the position of the character "-" within the column, and returns -1 if the string is not found. Code = IFERROR(SEARCH("-",[PostalCode]),-1) Comments Note that the data type of the value that you use as an error output must match the data type of the non-error output type. In this case, you provide a numeric value to be output in case of an error because SEARCH returns an integer value. However, you could also return a blank (empty string) by using BLANK() as the second argument to IFERROR. See Also MID REPLACE TEXT functions SUBSTITUTE Function Replaces existing text with new text in a text string. Syntax SUBSTITUTE(<text>, <old_text>, <new_text>, <instance_num>) Parameters Term Definition text The text in which you want to substitute characters, or a reference to a column containing text. old_text The existing text that you want to replace. new_text The text you want to replace old_text with. instance_num (optional) The occurrence of old_text you want to replace. If omitted, every instance of old_text is replaced Property Value/Return Value 301 A string of text. Remarks Use the SUBSTITUTE function when you want to replace specific text in a text string; use the REPLACE function when you want to replace any text of variable length that occurs in a specific location in a text string. The SUBSTITUTE function is case-sensitive. If case does not match between text and old_text, SUBSTITUTE will not replace the text. This DAX function may return different results when used in a model that is deployed and then queried in DirectQuery mode. For more information about semantic differences in DirectQuery mode, see http://go.microsoft.com/fwlink/?LinkId=219171. Example: Substitution within a String Description The following formula creates a copy of the column [Product Code] that substitutes the new product code NW for the old product code PA wherever it occurs in the column. Code =SUBSTITUTE([Product Code], "NW", "PA") See Also Text functions REPLACE (DAX) TRIM Function Removes all spaces from text except for single spaces between words. Syntax TRIM(<text>) Parameters Term Definition text The text from which you want spaces removed, or a column that contains text. Property Value/Return Value The string with spaces removed. Remarks Use TRIM on text that you have received from another application that may have irregular spacing. 302 The TRIM function was originally designed to trim the 7-bit ASCII space character (value 32) from text. In the Unicode character set, there is an additional space character called the nonbreaking space character that has a decimal value of 160. This character is commonly used in Web pages as the HTML entity,  . By itself, the TRIM function does not remove this nonbreaking space character. For an example of how to trim both space characters from text, see Remove spaces and nonprinting characters from text. Example Description The following formula creates a new string that does not have trailing white space. Code =TRIM("A column with trailing spaces. ") Comments When you create the formula, the formula is propagated through the row just as you typed it, so that you see the original string in each formula and the results are not apparent. However, when the formula is evaluated the string is trimmed. You can verify that the formula produces the correct result by checking the length of the calculated column created by the previous formula, as follows: =LEN([Calculated Column 1]) See Also Text functions UPPER Function Converts a text string to all uppercase letters Syntax UPPER (<text>) Parameters Term Definition text The text you want converted to uppercase, or a reference to a column that contains text. Property Value/Return Value Same text, in uppercase. Example 303 Description The following formula converts the string in the column, [ProductCode], to all uppercase. Non-alphabetic characters are not affected. Code =UPPER(['New Products'[Product Code]) See Also Text functions LOWER (DAX) VALUE Function Converts a text string that represents a number to a number. Syntax VALUE(<text>) Parameters Term Definition text The text to be converted. Return Value The converted number in decimal data type. Remarks The value passed as the text parameter can be in any of the constant, number, date, or time formats recognized by Microsoft Excel and the PowerPivot Add-in. If text is not in one of these formats, an error is returned. For more information about PowerPivot data types, see Data Types. You do not generally need to use the VALUE function in a formula because the PowerPivot add-in implicitly converts text to numbers as necessary. You can also use column references. For example, if you have a column that contains mixed number types, VALUE can be used to convert all values to a single numeric data type. However, if you use the VALUE function with a column that contains mixed numbers and text, the entire column is flagged with an error, because not all values in all rows can be converted to numbers. Example Description The following formula converts the typed string, "3", into the numeric value 3. 304 Code =VALUE("3") Comments See Also Text functions Formula Compatibility in DirectQuery Mode The Data Analysis Expression language (DAX) can be used to create measures and other custom formulas that you use in tabular models and in PowerPivot workbooks. In almost every respect, the models that you create in these two environments are identical, and you can use the same measures, relationships, and KPIs, etc. However, if you build a tabular model and deploy it in DirectQuery mode, there are some restrictions on the formulas that you can use. This topic provides an overview of the differences, lists the functions that are not supported in DirectQuery mode, and lists the functions that are supported but might return different results. Within this topic, we use the term in-memory model to refer to both PowerPivot models, which use a local cache, as well as tabular models, which are fully hosted in memory data on an Analysis Services server running in Tabular mode. We use DirectQuery models to refer to tabular models that have been deployed in DirectQuery mode. For information about DirectQuery mode, see DQ Intro. Semantic Differences Describes the types of differences that might arise when the same formula is used to DirectQuery mode. • Comparisons • Casts • Mathematical functions and arithmetic operations • Supported Numeric and Date-Time Ranges • Currency • Aggregation Functions • Text Functions Functions Supported in DirectQuery Mode This section lists functions that can be used in DirectQuery mode, but which might return different results. Functions Not Supported in DirectQuery Mode The section lists functions that cannot be used in models deployed in DirectQuery mode. 305 Functions that are not in either of these lists are expected to behave identically regardless of the model storage or query mode. Overview of Differences between In-Memory and DirectQuery Mode Queries on a model deployed in DirectQuery mode can return different results than when the same model is deployed in-memory, because data is fetched directly from a relational data store and aggregations required by formulas are performed using the relevant relational engine, rather than using the xVelocity in-memory analytics engine (VertiPaq) for storage and calculation. For example, there are differences in the way that certain relational data stores handle numeric values, dates, nulls, and so forth. In contrast, the DAX language is intended to emulate as closely as possible the behavior of functions in Microsoft Excel. For example, when handling nulls, empty strings and zero values, Excel attempts to provide the best answer regardless of the precise data type, and therefore the xVelocity engine does the same. However, when a tabular model is deployed in DirectQuery mode and passes formulas to a relational data source for evaluation, the data must be handled according to the semantics of the relational data source, which typically require distinct handling of empty strings vs. nulls. For this reason, the same formula might return a different result when evaluated against cached data and against data fetched solely from the relational store. Additionally, some functions cannot be used at all in DirectQuery mode because the calculation would require that the data in the current context be sent to the relational data source as a parameter. For example, measures in a PowerPivot workbook often use time intelligence functions that reference date ranges available within the workbook. Such formulas generally cannot be used in DirectQuery mode. List of Semantic Differences This section lists the types of semantic differences that you can expect, and describes any limitations that might apply to the usage of functions or to query results. Comparisons DAX in in-memory models supports comparisons of two expressions that resolve to scalar values of different data types. However, models that are deployed in DirectQuery mode use the data types and comparison operators of the relational engine, and therefore might return different results. The following comparisons will always generate an error when used in a calculation on a DirectQuery data source: • Numeric data type compared to any string data type • Numeric data type compared to a Boolean value • Any string data type compared to a Boolean value 306 In general, DAX is more forgiving of data type mismatches in in-memory models, and will attempt an implicit cast of values up to two times, as described in this section. However, formulas sent to a relational data store in DirectQuery mode are evaluated more strictly, following the rules of the relational engine, and are more likely to fail. Comparisons of strings and numbers EXAMPLE: “2” < 3 The formula compares a text string to a number. The expression is true in both DirectQuery mode and in-memory models. In an in-memory model, the result is true because numbers as strings are implicitly cast to a numerical data type for comparisons with other numbers. SQL also implicitly casts text numbers as numbers for comparison to numerical data types. Note that this represents a change in behavior from the first version of PowerPivot, which would return false, because the text “2” would always be considered larger than any number. Comparison of text with Boolean EXAMPLE: “VERDADERO” = TRUE This expression compares a text string with a Boolean value. In general, for DirectQuery or In-Memory models, comparing a string value to a Boolean value results in an error. The only exceptions to the rule are when the string contains the word true or the word false; if the string contains any of true or false values, a conversion to Boolean is made and the comparison takes place giving the logical result. Comparison of nulls EXAMPLE: EVALUATE ROW("X", BLANK() = BLANK()) This formula compares the SQL equivalent of a null to a null. It returns true in inmemory and DirectQuery models; a provision is made in DirectQuery model to guarantee similar behavior to in-memory model. Note that in Transact-SQL, a null is never equal to a null. However, in DAX, a blank is equal to another blank. This behavior is the same for all in-memory models. It is important to note that DirectQuery mode uses, most of, the semantics of SQL Server; but, in this case it separates from it giving a new behavior to NULL comparisons. Casts There is no cast function as such in DAX, but implicit casts are performed in many comparison and arithmetic operations. It is the comparison or arithmetic operation that determines the data type of the result. For example, • Boolean values are treated as numeric in arithmetic operations, such as TRUE + 1, or the function MIN applied to a column of Boolean values. A NOT operation also returns a numeric value. 307 • Boolean values are always treated as logical values in comparisons and when used with EXACT, AND, OR, &&, or ||. Cast from string to Boolean In in-memory and DirectQuery models, casts are permitted to Boolean values from these strings only: “” (empty string), “true”, “false”; where an empty string casts to false value. Casts to the Boolean data type of any other string results in an error. Cast from string to date/time In DirectQuery mode, casts from string representations of dates and times to actual datetime values behave the same way as they do in SQL Server. For information about the rules governing casts from string to datetime data types in PowerPivot models, see the DAX Syntax Specification. Models that use the in-memory data store support a more limited range of text formats for dates than the string formats for dates that are supported by SQL Server. However, DAX supports custom date and time formats. For more information, see DAX Predefined Date formats and Custom date formats. Cast from string to other non Boolean values When casting from strings to non-Boolean values, DirectQuery mode behaves the same as SQL Server. For more information, see Cast and Convert. Cast from numbers to string not allowed EXAMPLE: CONCATENATE(102,”,345”) Casting from numbers to strings is not allowed in SQL Server. This formula returns an error in tabular models and in DirectQuery mode; however, the formula produces a result in PowerPivot. No support for two-try casts in DirectQuery In-memory models often attempt a second cast when the first one fails. This never happens in DirectQuery mode. EXAMPLE: TODAY() + “13:14:15” In this expression, the first parameter has type datetime and second parameter has type string. However, the casts when combining the operands are handled differently. DAX will perform an implicit cast from string to double. In in-memory models, the formula engine attempts to cast directly to double, and if that fails, it will try to cast the string to datetime. In DirectQuery mode, only the direct cast from string to double will be applied. If this cast fails, the formula will return an error. 308 Math Functions and Arithmetic Operations Some mathematical functions will return different results in DirectQuery mode, because of differences in the underlying data type or the casts that can be applied in operations. Also, the restrictions described above on the allowed range of values might affect the outcome of arithmetic operations. Order of addition When you create a formula that adds a series of numbers, an in-memory model might process the numbers in a different order than a DirectQuery model. Therefore, when you have many very large positive numbers and very large negative numbers, you may get an error in one operation and results in another operation. Use of the POWER function EXAMPLE: POWER(-64, 1/3) In DirectQuery mode, the POWER function cannot use negative values as the base when raised to a fractional exponent. This is the expected behavior in SQL Server. In an in-memory model, the formula returns -4. Numerical overflow operations In Transact-SQL, operations that result in a numerical overflow return an overflow error; therefore, formulas that result in an overflow also raise an error in DirectQuery mode. However, the same formula when used in an in-memory model returns an eight-byte integer. That is because the formula engine does not perform checks for numerical overflows. LOG functions with blanks return different results SQL Server handles nulls and blanks differently than the xVelocity engine. As a result, the following formula returns an error in DirectQuery mode, but return infinity in inmemory mode. EXAMPLE: LOG(blank()) The same limitations apply to the other logarithmic functions: LOG10 and LN. For more information about the blank data type in DAX, see DAX Specification. Syntax Division by 0 and division by Blank In DirectQuery mode, division by zero (0) or division by BLANK will always result in an error. SQL Server does not support the notion of infinity, and because the natural result of any division by 0 is infinity, the result is an error. However, SQL Server supports division by nulls, and the result must always equal null. Rather than return different results for these operations, in DirectQuery mode, both types of operations (division by zero and division by null) return an error. Note that, in Excel and in PowerPivot models, division by zero also returns an error. Division by a blank returns a blank. 309 The following expressions are all valid in in-memory models, but will fail in DirectQuery mode: 1/BLANK 1/0 0.0/BLANK 0/0 The expression BLANK/BLANK is a special case that returns BLANK in both for inmemory models, and in DirectQuery mode. Supported Numeric and Date-Time Ranges Formulas in PowerPivot and tabular models in memory are subject to the same limitations as Excel with regard to maximum allowed values for real numbers and dates. However, differences can arise when the maximum value is returned from a calculation or query, or when values are converted, cast, rounded, or truncated. • If values of types Currency and Real are multiplied, and the result is larger than the maximum possible value, in DirectQuery mode, no error is raised, and a null is returned. • In in-memory models, no error is raised, but the maximum value is returned. In general, because the accepted date ranges are different for Excel and SQL Server, results can be guaranteed to match only when dates are within the common date range, which is inclusive of the following dates: • Earliest date: March 1, 1990 • Latest date: December 31, 9999 If any dates used in formulas fall outside this range, either the formula will result in an error, or the results will not match. Floating point values supported by CEILING EXAMPLE: EVALUATE ROW("x", CEILING(-4.398488E+30, 1)) The Transact-SQL equivalent of the DAX CEILING function only supports values with magnitude of 10^19 or less. A rule of thumb is that floating point values should be able to fit into bigint. Datepart functions with dates that are out of range Results in DirectQuery mode are guaranteed to match those in in-memory models only when the date used as the argument is in the valid date range. If these conditions are not satisfied, either an error will be raised, or the formula will return different results in DirectQuery than in in-memory mode. EXAMPLE: MONTH(0) or YEAR(0) In DirectQuery mode, the expressions return 12 and 1899, respectively. In in-memory models, the expressions return 1 and 1900, respectively. 310 EXAMPLE: EOMONTH(0.0001, 1) The results of this expression will match only when the data supplied as a parameter is within the valid date range. EXAMPLE: EOMONTH(blank(), blank()) or EDATE(blank(), blank()) The results of this expression should be the same in DirectQuery mode and in-memory mode. Truncation of time values EXAMPLE: SECOND(1231.04097222222) In DirectQuery mode, the result is truncated, following the rules of SQL Server, and the expression evaluates to 59. In in-memory models, the results of each interim operation are rounded; therefore, the expression evaluates to 0. The following example demonstrates how this value is calculated: 1. The fraction of the input (0.04097222222) is multiplied by 24. 2. The resulting hour value (0.98333333328) is multiplied by 60. 3. The resulting minute value is 58.9999999968. 4. The fraction of the minute value (0.9999999968) is multiplied by 60. 5. The resulting second value (59.999999808) rounds up to 60. 6. 60 is equivalent to 0. SQL Time data type not supported In-memory models do not support use of the new SQL Time data type. In DirectQuery mode, formulas that reference columns with this data type will return an error. Time data columns cannot be imported into an in-memory model. However, in PowerPivot and in cached models, sometimes the engine casts the time value to an acceptable data type, and the formula returns a result. This behavior affects all functions that use a date column as a parameter. Currency In DirectQuery mode, if the result of an arithmetic operation has the type Currency, the value must be within the following range: • Minimum: • Maximum: Combining currency and REAL data types EXAMPLE: Currency sample 1 If Currency and Real types are multiplied, and the result is larger than 9223372036854774784 (), DirectQuery mode will not raise an error. In an in-memory model, an error is raised if the absolute value of the result is larger 311 than . Operation results in an out-of-range value EXAMPLE: Currency sample 2 If operations on any two currency values result in a value that is outside the specified range, an error is raised in in-memory models, but not in DirectQuery models. Combining currency with other data types Division of currency values by values of other numeric types can result in different results. Aggregation Functions Statistical functions on a table with one row return different results. Aggregation functions over empty tables also behave differently in in-memory models than they do in DirectQuery mode. Statistical functions over a table with a single row If the table that is used as argument contains a single row, in DirectQuery mode, statistical functions such as STDEV and VAR return null. In an in-memory model, a formula that uses STDEV or VAR over a table with a single row returns a division by zero error. Text Functions Because relational data stores provide different text data types than does Excel, you may see different results when searching strings or working with substrings. The length of strings also can be different. In general, any string manipulation functions that use fixed-size columns as arguments can have different results. Additionally, in SQL Server, some text functions support additional arguments that are not provided in Excel. If the formula requires the missing argument you can get different results or errors in the in-memory model. Operations that return a character using LEFT, RIGHT, etc. may return the correct character but in a different case, or no results EXAMPLE: LEFT([“text”], 2) In DirectQuery mode, the case of the character that is returned is always exactly the same as the letter that is stored in the database. However, the xVelocity engine uses a different algorithm for compression and indexing of values, to improve performance. By default, the Latin1_General collation is used, which is case-insensitive but accentsensitive. Therefore, if there are multiple instances of a text string in lower case, upper case, or mixed case, all instances are considered the same string, and only the first instance of the string is stored in the index. All text functions that operate on stored strings will retrieve the specified portion of the indexed form. Therefore, the example 312 formula would return the same value for the entire column, using the first instance as the input. String Storage and Collation in Tabular Models This behavior also applies to other text functions, including RIGHT, MID, and so forth. String length affects results EXAMPLE: SEARCH(“within string”, “sample target text”, 1, 1) If you search for a string using the SEARCH function, and the target string is longer than the within string, DirectQuery mode raises an error. In an in-memory model, the searched string is returned, but with its length truncated to the length of <within text>. EXAMPLE: EVALUATE ROW("X", REPLACE("CA", 3, 2, "California") ) If the length of the replacement string is greater than the length of the original string, in DirectQuery mode, the formula returns null. In in-memory models, the formula follows the behavior of Excel, which concatenates the source string and the replacement string, which returns CACalifornia. Implicit TRIM in the middle of strings EXAMPLE: TRIM(“ A sample sentence with leading white space”) DirectQuery mode translates the DAX TRIM function to the SQL statement LTRIM(RTRIM(<column>)). As a result, only leading and trailing white space is removed. In contrast, the same formula in an in-memory model removes spaces within the string, following the behavior of Excel. Implicit RTRIM with use of LEN function EXAMPLE: LEN(‘string_column’) Like SQL Server, DirectQuery mode automatically removes white space from the end of string columns: that is, it performs an implicit RTRIM. Therefore, formulas that use the LEN function can return different values if the string has trailing spaces. In-memory supports additional parameters for SUBSTITUTE EXAMPLE: SUBSTITUTE([Title],”Doctor”,”Dr.”) EXAMPLE: SUBSTITUTE([Title],”Doctor”,”Dr.”, 2) In DirectQuery mode, you can use only the version of this function that has three (3) parameters: a reference to a column, the old text, and the new text. If you use the second formula, an error is raised. In in-memory models, you can use an optional fourth parameter to specify the instance number of the string to replace. For example, you can replace only the second instance, 313 etc. Restrictions on string lengths for REPT operations In in-memory models, the length of a string resulting from an operation using REPT must be less than 32,767 characters. This limitation does not apply in DirectQuery mode. Substring operations return different results depending on character type EXAMPLE: MID([col], 2, 5) If the input text is varchar or nvarchar, the result of the formula is always the same. However, if the text is a fixed-length character and the value for <num_chars> is greater than the length of the target string, in DirectQuery mode, a blank is added at the end of the result string. In an in-memory model, the result terminates at the last string character, with no padding. Functions Supported in DirectQuery Mode The following DAX functions can be used in DirectQuery mode, but with the qualifications as described in the preceding section. Text functions CONCATENATE FIND LEFT LEN MID REPLACE REPT RIGHT SUBSTITUTE TRIM Statistical functions COUNT STDEV.P STDEV.S STDEVX.P STDEVX.S VAR.P VAR.S 314 VARX.P VARX.S Date/time functions DATE EDATE EOMONTH DATE TIME SECOND Math and number functions CEILING LN LOG LOG10 POWER DAX Table queries There are some limitations when you evaluate formulas against a DirectQuery model by using DAX Table queries. DirectQuery does not support referring to the same column twice in an ORDER BY clause. The equivalent Transact-SQL statement cannot be created and the query fails. In an in-memory model, repeating the ORDER by clause has no effect on the results. Functions Not Supported in DirectQuery Mode Some DAX functions are not supported in models that are deployed in DirectQuery mode. The reasons that a particular function is not supported can include any or a combination of these reasons: • The underlying relational engine cannot perform calculations equivalent to those performed by the xVelocity engine. • The formula cannot be converted to en equivalent SQL expression. • The performance of the converted expression and the resulting calculations would be unacceptable. The following DAX functions cannot be used in DirectQuery models. Path functions PATH PATHCONTAINS PATHITEM PATHITEMREVERSE 315 PATHLENGTH Misc functions COUNTBLANK FIXED FORMAT RAND RANDBETWEEN Time intelligence functions: Start and end dates DATESQTD DATESYTD DATESMTD DATESQTD DATESINPERIOD TOTALMTD TOTALQTD TOTALYTD DATESINPERIOD SAMEPERIODLASTYEAR PARALLELPERIOD Time intelligence functions: Balances OPENINGBALANCEMONTH OPENINGBALANCEQUARTER OPENINGBALANCEYEAR CLOSINGBALANCEMONTH CLOSINGBALANCEQUARTER CLOSINGBALANCEYEAR Time intelligence functions: Previous and next periods PREVIOUSDAY PREVIOUSMONTH PREVIOUSQUARTER PREVIOUSYEAR NEXTDAY NEXTMONTH NEXTQUARTER NEXTYEAR 316 Time intelligence functions: Periods and calculations over periods STARTOFMONTH STARTOFQUARTER STARTOFYEAR ENDOFMONTH ENDOFQUARTER ENDOFYEAR FIRSTDATE LASTDATE DATEADD See Also Direct Query Intro 317

Data Analysis Expressions - DAX - Reference

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